python loop function

for loop in python

1. #for loop format (similar foreach in Java): for identifier in list name:

2. ##>>> movies = ["movie1","movie2","movie3"]

3. #>>> for item in movies :

4. ##print(item)

#movie1

7. ##movie2

8. movie3

9. The for loop in Python is similar to the foreach loop in Java. See the comments for the fixed format

   Among them: for means the beginning of the loop and should appear in front of the identifier; in separates the list to be looped from the identifier; : is placed after the list name to indicate the start of the list processing code; please note that the list processing code must be placed Below the for loop and indented! ! !

   When the for loop starts, Python will assign each value in the list to the identifier, which also means that the value of the identifier is different each time the loop is executed; the loop will continue to iterate until the processing is completed All data in the list.

   while loop in python
   

   1. while loop format: while loop condition:

   2. #>>>whilecount <len(movies):

   3. ##print(movies[count])

   4. ## count

      = count1

   movie1
   movie2

   9. movie3

   Compared with the for loop, the while loop has more conditional judgment statements, both You can customize the conditions for the end of the loop

   Python's judgment


   1. if Satisfy a certain condition :

   2. ##Execute certain statements

   3. ##else :

   4. Execute certain statements

   Note: if Statements and else statements must be added with: at the end, and the code to be executed after if and else must be indented
   Python's function

   1. >>> new_movies = ["movie1","movie2","movie3",["movie4_1","movie4_2",["movie_4_3_1","movie_4_3_2" ]],"movie5"]

   2. ##>> >

      def listItems(items):

   3. for item in items :

   4. ifisinstance(item,list) :

   5. listItems(item)

   6. else :

   7. print(item)

   10. >>> listItems(new_movies)

   11. movie1

   12. movie2

   13. ##movie3

   14. movie4_1

   15. ##movie4_2

   16. movie_4_3_1

   17. ##movie_4_3_2

   18. movie5
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