PART 3 - Python Tutorial | For Loop In Python With Examples

Oct 12, 2020Download as pptx, pdf

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This document discusses Python for loops and lists. It covers iterating through lists with for loops, avoiding indentation errors, creating numerical lists with the range function, slicing lists to access subsets of elements, copying lists, and using list comprehensions. Examples are provided like printing a multiplication table using a one-line list comprehension and slicing a fruits list to print elements at odd and even positions.

PART 3 - Python Tutorial | For Loop In Python With Examples

AGENDA
• FOR LOOP IN PYTHON
• INDENTATION IN PYTHON
• LIST COMPREHENSIONS
• SLICING A LIST
• COPYING A LIST

ISSUES WITH THIS APPROACH
• Repetitive code
• Need to change the code if the list size changes

WHAT IS INDENTATION
• Indentation is used to make code more readability easier
• In languages like c, c++, python etc. , indentation is optional
• In Python, it is mandatory
• Python uses indentation to determine how a line, or group of lines, is
related to the rest of the program.
• Change indentation and the meaning of code changes

FORGETTING THE COLON ( so tough to find )

USING SPACES VS TABS
• Spaces - consistent on every text editor
• Tabs – not consistent on every text editor
• Can be 4 spaces
• Can be 8 spaces
• Mixing tabs and spaces causes error
• I prefer using 4 spaces for indentation
• Do not type spaces 4 times

RANGE FUNCTION
• Start to (end-1)
• Print 1 to 6
• Similar to other
programming languages

PRINT MULTIPLICATION TABLE OF 5
Output – [5, 10, 15, ……….., 50]

SIMPLE STATISTICS WITH A LIST OF NUMBERS
• Maximum of a list
• Minimum of a list
• Sum of a list

LIST COMPREHENSIONS
• A list comprehension combines the for loop and the creation of new
elements into one line, and automatically appends each new
element.
• Multiplication table in one line
• Not for beginner but you will see this in others code

WORKING WITH A PART OF A LIST
• Can we access multiple list elements at one go ?
• Welcome to slice in python
• Slice of pizza ?
• Not present in all programming languages

SLICING A LIST
• To make a slice, you specify the index of the first and last elements
you want to work with.
• Like range, the last element is not considered
• List can also be of strings or
any data type

ASSIGNMENT
• Print square of numbers from 1 to 10 using for loop
• Store it a list first and then print
• One liner code
• fruits = [‘banana’, ‘apple’, ‘watermelon’, ‘orange’]
• Print first 2 fruits ( using slicing )
• Print last 2 fruits (suing slicing )
• Print fruits at odd positions ( using for loop )
• Print fruits at even positions (using for loop )
• Paste your code in the comment

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