PART 3 - Python Tutorial | For Loop In Python With Examples
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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.
![PRINT MULTIPLICATION TABLE OF 5
Output – [5, 10, 15, ……….., 50]](https://image.slidesharecdn.com/lists-201012055722/85/PART-3-Python-Tutorial-For-Loop-In-Python-With-Examples-29-320.jpg)
![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](https://image.slidesharecdn.com/lists-201012055722/85/PART-3-Python-Tutorial-For-Loop-In-Python-With-Examples-38-320.jpg)
PART 3 - Python Tutorial | For Loop In Python With Examples
- 2. PART 3 WORKING WITH LISTS AND FOR LOOP • WANT TO LEARN PYTHON PROGRAMMING? (SUBTITLES) • SUBSCRIBE • TELEGRAM – FreeCodeSchool • Twitter – shivammitra4 • LinkedIn – shivammitra • Link in description • Playlist link in description
- 3. AGENDA • FOR LOOP IN PYTHON • INDENTATION IN PYTHON • LIST COMPREHENSIONS • SLICING A LIST • COPYING A LIST
- 4. PRINT EACH NAME IN THE LIST
- 5. ISSUES WITH THIS APPROACH • Repetitive code • Need to change the code if the list size changes
- 6. FOR LOOP FOR PRINTING THE LIST
- 9. EXPLAINING HOW FOR LOOP WORKED
- 13. 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
- 17. LOGICAL ERROR
- 19. FORGETTING THE COLON ( so tough to find )
- 20. TABS VS SPACES FOR INDENTATION
- 22. WHAT’S THE ACTUAL ISSUE ?
- 23. 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
- 25. RANGE FUNCTION • Start to (end-1) • Print 1 to 6 • Similar to other programming languages
- 27. USING RANGE TO STORE A LIST OF NUMBERS
- 28. SKIPPING NUMBERS WITHIN A RANGE
- 29. PRINT MULTIPLICATION TABLE OF 5 Output – [5, 10, 15, ……….., 50]
- 30. SIMPLE STATISTICS WITH A LIST OF NUMBERS • Maximum of a list • Minimum of a list • Sum of a list
- 31. 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
- 32. 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
- 33. 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
- 35. LOOPING THROUGH A SLICE
- 36. COPYING A LIST
- 38. 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
- 39. IF ELSE STATEMENTS IN PYTHON