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python loop function

步履不停Original: 2019-07-01 13:50:004086browse

for loop in python

#for loop format (similar foreach in Java): for identifier in list name:
##>>> movies = ["movie1","movie2","movie3"]
#>>> for item in movies :
##print(item) 


##movie2

movie3
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. #>>> while count < len(movies) :
3. ##print(movies[count])
4. ## count
 = count 1
6. 
7.  
8. </li><li><code class="language-py" style="line-height: 1.8; margin: 1px 5px; vertical-align: middle; display: inline-block; font-family: "Courier New", sans-serif !important; font-size: 12px !important; background-color: rgb(245, 245, 245) !important; border: 1px solid rgb(204, 204, 204) !important; padding: 0px 5px !important; border-radius: 3px !important;">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
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. if isinstance(item,list) :
5.  listItems(item)
6. else :
7.  print(item)
9. 
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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