Writing First Python Program | Printing to Console in Python | Python Tutorials for Beginners #lec4

Summary

In this video, we learn how to write our first Python program using the PyCharm IDE. The instructor walks us through printing 'Hello, World!' on the console, explaining the usage of the print function in Python 3.x. The video covers the basics of syntax, including proper use of quotes and parentheses, and demonstrates handling syntax errors. It also highlights the differences between Python 2.x and 3.x regarding the print function. Finally, the video offers practical tips on using PyCharm's features, such as syntax highlighting and error identification, ensuring viewers are comfortable with writing and running simple Python code.

Takeaways

• 💻 The video is part of a series on learning Python, focusing on setting up the development environment with Python and PyCharm IDE.
• 🔧 Viewers are assumed to have already installed Python 3.10.6 and PyCharm, which are necessary for writing and running Python programs.
• 📝 The first program in any new programming language is traditionally 'Hello World', and the video demonstrates how to print this to the console in Python.
• 🖥️ Python is an interpreted language, and the base interpreter has been installed as part of the setup process.
• 🔑 The `print` function is used in Python 3.x to display output on the console, unlike Python 2.x where `print` was a statement.
• 📚 No need for header files or a `main` function in Python, unlike some other languages like C or C++.
• 🌐 The `print` function in Python requires the message to be enclosed in parentheses, which is a syntax requirement specific to Python 3.x.
• 🛠️ The video mentions that missing or incorrect syntax will result in errors, which are highlighted by the IDE to assist developers.
• 🎨 The PyCharm IDE offers features like syntax highlighting and auto-completion, which help in writing correct and efficient code.
• 🔄 The video also touches on the differences between Python 2.x and Python 3.x, emphasizing that the latter requires parentheses for the `print` function.
• 🔍 Errors such as 'SyntaxError: missing parenthesis in call to print' are explained, showing how the IDE helps identify and correct mistakes.

Q & A

What programming language is being discussed in the video?

The video discusses the Python programming language.

What is the purpose of the video?

The purpose of the video is to teach viewers how to write their first program in Python, specifically how to print 'Hello World' on the console.

What is the difference between Python 2.x and Python 3.x in terms of the print function?

In Python 2.x, print was a statement and did not require parentheses. In Python 3.x, print is a function and requires parentheses to work properly.

What is the name of the IDE used in the video for Python programming?

The IDE used in the video is PyCharm.

What is the version of Python discussed in the video?

The video discusses Python version 3.10.6.

What is the basic syntax for printing a message in Python 3.x?

In Python 3.x, the basic syntax for printing a message is 'print("message")', where 'message' is the text you want to print.

What happens if you run a print function with an unterminated string in Python?

Running a print function with an unterminated string in Python will result in a syntax error, specifically an 'unterminated string literal' error.

What is the significance of the parentheses in the print function in Python 3.x?

In Python 3.x, the parentheses in the print function are necessary because print is a function call, and the text to be printed must be enclosed within them.

What does the video mention about the support for Python 2.x versions?

The video mentions that support for Python 2.x versions has ended.

What is the file extension for Python files?

The file extension for Python files is '.py'.

What is the term used to describe the rules for writing programs in a programming language?

The term used to describe the rules for writing programs in a programming language is 'syntax'.

Outlines

00:00

💻 Setting Up Python Environment and Writing 'Hello World'

This paragraph introduces the prerequisites for beginning Python programming, including the installation of Python 3.10.6 and the PyCharm IDE. It emphasizes the importance of having a Python interpreter and an IDE to write programs. The speaker guides viewers on how to write their first Python program, which traditionally prints 'Hello World' to the console. The explanation covers the use of the 'print' function in Python 3.x, contrasting it with Python 2.x where 'print' was a statement rather than a function. The paragraph also touches on the concept of an interpreted language and the simplicity of printing to the console in Python without the need for headers or a main function.

05:03

🖌️ Customizing PyCharm IDE and Demonstrating 'Hello World'

The speaker discusses changing the color theme in PyCharm for better visibility and comfort. They guide the user through creating a new Python file with the '.py' extension and writing the 'print' function to display 'Hello World'. The paragraph includes a demonstration of how to use the 'print' function, including the auto-completion feature of the IDE, and running the program to see the output. It also covers common errors such as missing quotes and the importance of syntax in programming. The speaker explains the concept of syntax errors and how to identify and correct them, using the PyCharm IDE's features to highlight and resolve issues.

10:03

🔍 Understanding Syntax Errors and Advanced 'Print' Function Usage

This paragraph delves deeper into syntax errors, explaining the rules of programming language syntax and the consequences of not adhering to them. The speaker provides practical examples of syntax errors, such as unterminated string literals, and demonstrates how to resolve them. They also show how to use the 'print' function to print blank lines and explain the difference between Python 2.x and 3.x in terms of the 'print' statement and function. The paragraph concludes with a brief mention of future coding exercises related to the 'print' function, setting the stage for the next video in the series.

Keywords

💡IDE

IDE stands for Integrated Development Environment. It is a software application that provides comprehensive facilities to programmers for software development. In the video, the instructor discusses using PyCharm as the IDE to write and run Python programs, emphasizing its features like syntax highlighting and auto-completion.

💡Python Interpreter

A Python interpreter is a program that reads and executes Python code. The interpreter converts the high-level code into machine-readable instructions. The video mentions installing Python 3.10.6 interpreter, which is necessary to run Python programs.

💡Print Function

The print function is a built-in Python function used to output text to the console. The video explains how to use the print function to display the classic 'Hello World' message, highlighting its simplicity compared to other programming languages.

💡Syntax

Syntax refers to the rules that define the structure of a programming language. The video covers Python syntax for the print function, showing how to use parentheses and quotation marks correctly. Syntax errors are discussed, including common mistakes like missing parentheses or quotes.

💡String

A string is a sequence of characters enclosed in quotes, used to represent text in programming. In the video, the instructor demonstrates how to print strings in Python using double quotes and explains the difference between strings and code.

💡Hello World

'Hello World' is a simple program that outputs 'Hello World' to the console. It is often the first program written when learning a new programming language. The video uses this example to introduce the basic syntax and usage of the print function in Python.

💡Error Handling

Error handling involves identifying and resolving errors in a program. The video discusses syntax errors, such as missing parentheses or quotes, and how the IDE helps by highlighting mistakes. The instructor shows how to debug these errors using error messages.

💡Python 2.x vs. 3.x

Python 2.x and 3.x are different versions of the Python language, with 3.x being the latest and supported version. The video explains the differences in the print statement between these versions, noting that Python 2.x does not use parentheses for print, while Python 3.x does.

💡Auto-completion

Auto-completion is a feature in IDEs that predicts and suggests code as you type, helping to write code faster and reduce errors. The video highlights this feature in PyCharm, showing how it assists with the print function's syntax.

💡Console

The console is an interface that allows users to interact with a program by typing commands and receiving text output. The video demonstrates using the console to run Python programs and view the output of the print function.

Highlights

Introduction to downloading and installing Python and PyCharm IDE.

Installation of Python interpreter version 3.10.6.

Setting up a Python environment with an IDE and interpreter.

Writing the first Python program to print 'Hello World' on the console.

Explanation of the 'print' function in Python 3.x.

Difference between Python 2.x and 3.x regarding the 'print' statement and function.

Demonstration of how to use the 'print' function without additional headers or a main function.

Running a Python file with a .py extension in PyCharm IDE.

Implications of omitting parentheses in the 'print' function in Python 3.x.

Practical demonstration of running a Python program in PyCharm IDE.

Error handling in PyCharm IDE for missing closing quotes.

Understanding syntax errors and their role in programming language rules.

Auto-completion feature of PyCharm IDE for the 'print' function.

Syntax highlighting in PyCharm IDE to identify errors.

Experimenting with the 'print' function to show the effects of missing parentheses.

Explanation of the invisible new line character produced by the 'print' function.

Customization of PyCharm IDE appearance for user preference.

Creating a new Python file in an existing project within PyCharm IDE.

Discussion of single and double quotes usage in Python strings.

Upcoming coding exercises related to the 'print' function in the next video.

Transcripts

so in the series of learning python

programming language

in the previous video we have discussed

like how to download and install

ide for python pycharm we have installed

and

python interpreter you can see python

3.10.6 we have installed right so now i

guess you're all set with your laptop

you have python you have an id to write

your programs right you have that

interpreter also

okay because python is an interpreted

language so we have already

now downloaded and installed a base

interpreter for our python language

i hope you have done this thing

now in this video we'll see

how to print something on console or you

can say we will write our first program

in python

and what usually we do whenever you

learn a new programming language the

first program you write is you print

that

classical hello world

on output screen on the console the same

thing we will do we'll print hello world

on the screen on the console

right in python

so

to print like in c we use which function

print a function in c plus plus we use c

out to print something on the screen

in python what do we use in python 3.10

through point x

version python 1.x python 2.x python 3.x

but python 2.x version they have ended

the support for python two point x uh

version right two point one two point

two like this

now

three point x we are working on three

point ten basically the recent is three

point ten point six

so in this we have a function named

print

this is the function print

so this we use to print something on the

console

okay

now don't need to read and don't need to

write any header file or anything or

main function or anything

simply you need to write

what

print whatever you want to print

the string or you can say the string

or whatever message you want to print

that we will put here

within these parentheses

okay

so i want to print hello world so simply

in double quotes i'll write

hello world

that's it no semicolon nothing else

if you will run this on your output

screen you will get this program this

output hello world

if you don't print anything if simply

you write print and you click on run

on that file suppose i have a file the

extension of python file is dot py right

so

we are simply running this thing

empty parenthesis

it's okay it will run

what it will print just a blank line

okay

nothing would be shown just a blank line

cursor would be here nothing would be

shown

if i want if you execute two print

function then one and two two blank line

would be shown something like this

right

so

you can say it will

the sprint function

will produce

an invisible new line

character new line means add a new line

so it will produce an invisible new line

character

because of that new line character we

see

you know

a

new blank line on your screen

right i'll show you practically also

now whatever you want to print you just

write within these

codes

we let hello world simply write hello

world so now let me do some experiment

with this uh

what you have to write down this how you

can write down this thing if you don't

put this closing

codes what type of error you will get

and these things let's just do practical

on this

uh print function and see before going

to practical let me just this this is

what in python the syntax is python in

python 3 3.x in python two point x the

previous uh versions

print was just a statement it was not a

function so what we used to write in

that case print

and

hello world whatever you need to print

you can just

write down in these quotes so print

hello world that's it no parenthesis

so it was considered it was as a

statement in python 2.x but here in

python 3 it is

a function so if you are using python 3

point x version right then if you write

something like this if you don't put

these parentheses you will get

error message syntax error message right

if you are using python 2.x version you

can write down print something like this

so let's just do practical of this thing

so we have opened our pycharm ide and

let me just first

change the color

so you can go to file if you want to

change if you are comfortable with this

color you can go for this but i am not

comfortable so go to setting

and appearance in appearance just theme

and

i want

either this this light

or

window 10 lite this one

so you can go for any one

from here you can set these themes okay

so now let's change this color and

just click ok now i guess you can see it

clearly the code fine

now

we have created our first project in the

previous video and first file first dot

py okay

if you want to create another file what

you have to do in the first project on

first project just click right click new

and file and just name your file

okay

so i'm not going to create

in the first dot py only extension is

dot py

we are printing so

okay

how to print just use the sprint

function print

fine let me just write down again p r i

n t print and see it is showing you

this is the you know beauty of this ide

auto completion and see the print syntax

it is showing here you can write down

this values sap and file flash whatever

these things that also one by one will

be discussing but right now just if i

just click enter

it will give me like these parentheses

automatically so now within these

parentheses

i'm adding

hello

world

okay

now let me just run this for you first

see from here i have to select here main

file is selected so i am going to select

current file

so current file is first dot py

current file means i am working in this

file and let's just or you can click in

this

this is the run button or you can just

right click and

this run first

click on this

okay now here

it is going to run now and now it will

print on your screen hello world first

time you know it is taking some time

because of the indexing and all

so see you can see here hello world

fine if i miss this semi-colon this

sorry this um

double quote closing double quote

as you can see a red red underline

means there is something

wrong there is an error okay so this is

what you can say uh

this id will give you these kind of

things if you use id this is you can see

some features or

some advantages of using id c missing

closing codes

so from here only you will come to know

yeah you have missed quotes

or if you run this

here also you will get c now type of

error c syntax error syntax error it is

a syntax error

so types of errors there are many types

of error

okay that also ah with these parallely

with the code we will be seeing

this is what syntax error syntax means

what there are some rules to write

programs in any you know programming

language and those rules are known as

syntax if you don't follow the syntax

then

it will give syntax error

so now syntax or you can say like we

have grammar rules

okay

same in programming language also we

have some rules to write down these

programs so these are syntax known as

syntax

if now it is syntax error because syntax

is what in print

whatever string the message which is not

a code actually

see print is a code it will do something

it will tell the interpreter to do

something but this hello world is

rather than hello world i can write

jenny's lectures i can write

anything else like you are the best

so this is just a message it's not a

code

so other than the code whatever you

write the message or the string that we

will put in

quotes

okay single quotes as well as double

quotes that also will discuss when to

put single code when to put double quote

okay now right now i'm putting double

quote because actually i am from c and c

plus background so

to write down string i used to put the

string the sequence of character as a

string in double quotes

okay

so now see syntax error it will give

syntax error unterminated string literal

hello world this is a string literal it

is unterminated you haven't terminated

this thing detected at line number one

line number one

this is also a skill to identify what is

the error type of error in which line at

all

okay

so you have to you know learn this thing

also parallel

okay now see you can see one arrow here

you have

started this string literal but you

haven't terminated here in line number

one

or if you are not getting what is the

error just simply

the error then text error this thing

copy this thing

open your google

paste that

and just click enter

okay or more specifically you can write

this error in python in whatever

programming language you are

you know practicing you're learning

so generally first you know that link

would be from stack overflow so there

someone has already asked this type of

questions and you will get many answers

simple okay so now let's just first what

you have to do

close this now see after closing

this is what

syntax highlighting also you need to

know the sprint is what in black the

string is what in

green

this hello world plus these codes in

green color okay and if you miss this

and these

ah what you can say

so the sprint is what in not in black

it's in blue and these parentheses are

in black so if you remove this double

quote from here this parenthesis and the

ending of the parentheses parenthesis

this is also in green color so there is

something wrong you can identify

okay

okay now put this one and just

run this again so it will print now

hello world whatever you want to print

you can print now if you don't put this

parenthesis

will give an error see you can see the

red underline here again

okay let me just run this

and it will give again some error see it

is giving syntax error missing

parenthesis in call to print

did you mean this print you are calling

print calling means print is a function

so we are calling print but missing

parenthesis missing parenthesis

because we are using three point

exposures and so

here you have to put

these parentheses

okay

now

okay what you need to do blank print you

can call

see

blank print also you can call it will

not print nothing but a blank line it

will call an individual new line

character so again if i write print

and call

you will see two blank new line same

three four five print plan you will call

these blank line would be increased like

this i hope now print is clear to you

now in next video i'll

discuss a coding exercise with you guys

okay

so i hope every point about print

function is clear to you guys how to

write down your first program how to

print something on console in python now

in the next video we will see a coding

exercise related to this print function

right so i'll see you in the next video

till then bye take