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#4 Python Tutorial for Beginners | Variables in Python

3,769,245 views October 28, 2018 10:22

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ChannelTelusko

In brief

This tutorial shows how to use variables in Python to store values, work with strings, and perform basic string operations like slicing, indexing, and concatenation. It’s perfect for absolute beginners looking to grasp Python’s foundational concepts.

Key steps

  1. Create a string variable with single or double quotes (e.g., name = 'shiva').
  2. Slice a string by specifying start and end indices (e.g., name[2:5]).
  3. Access characters using negative indexing (e.g., name[-1]).
  4. Concatenate strings with the + operator (e.g., name + ' telusko').

Questions & answers

How do I extract a substring from the start or end?

Use name[:5] for the start or name[-3:] for the end (excludes the end index).

Description from the creator

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In this lecture we are discussing variable in python:
Variable: It is a container where we can put our value
e.g
x=2 #here x is variable and 2 is value
x+3
5
y=3

Note:If I want to use output of previous operation so we use underscore (_)
_+y
8 # previous output 5 and y is 3

Use String as a variable:
-- Strings in python are surrounded by either single quotation marks, or double quotation marks.
-- e.g "shiva" ,'shiva'

Assign String to a Variable:
-- Assigning a string to a variable is done with the variable name followed by an equal sign and the string:
name='shiva'
name
shiva

Slicing String:
we can return a range of characters by using the slice syntax.
Specify the start index and the end index, separated by a colon, to return a part of the string.

-- Get the characters from position 2 to position 5 (not included):
name='youtube'
name[2:5]
'utu'

Slice From the Start:
name[:5] #from starting to index 5 (exclude)
'youtu'

Slice To the End:
name[2:] #from 2nd index to end
'utube'

Negative Indexing:

0 1 2 3 4 5 6 #positive indexing
y o u t u b e
-7 -6 -5 -4 -3 -2 -1 #Negative indexing

name[-1]
'e'

name[:-1]
'youtub'
name[:]
'youtube'
name [:0]
''
name[-5:-2]
'utu'

Concatenate String:
name+ ' telusko'
'youtube telusko'

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About this tutorial

Telusko published this 10:22 video tutorial on October 28, 2018. It has been watched 3,769,245 times on YouTube.

Channel
Telusko
Duration
10:22
Published
October 28, 2018
Views
3,769,245
Likes
64,921

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