Cheat Sheet

Inputs and Outputs Basics

Take Input From User

input() allows flexibility to take the input from the user. Reads a line of input as a string.

Code:

username = input()

print(username)

Input

Ajay

Output

Ajay

Working with Strings

String Concatenation

Joining strings together is called string concatenation.

Code

a = "Hello" + " " + "World"

print(a)

Output:

Hello World

Concatenation Errors

String Concatenation is possible only with strings.

Code:

a = "*" + 10

print(a)

Output:

File "main.py", line 1

a = "*" + 10

^

TypeError: can only concatenate str (not "int") to str

String Repetition

* operator is used for repeating strings any number of times as required.

Code:

a = "*" * 10

print(a)

Output:

**********

Code:

s = "Python"

s = ("* " * 3) + s + (" *" * 3)

print(s)

Output:

* * * Python * * *

Length of String

len() returns the number of characters in a given string.

Code:

username = input()

length = len(username)

print(length)

Input:

Ravi

Output:

4

String Indexing

We can access an individual character in a string using their positions (which start from 0) .

These positions are also called as index.

Code:

username = "Ravi"

first_letter = username[0]

print(first_letter)

Output:

R

IndexError

Attempting to use an index that is too large will result in an error:

Code:

username = "Ravi"

print(username[4])

Output:

IndexError: string index out