What are the loop statements that meet the Python condition
This article will explain in detail what are the loop sentences that meet the Python conditions, and the content of the article is of high quality, so the editor will share it with you for reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.
1. Python conditional statement
A Python conditional statement is a block of code that determines execution by the execution result of one or more statements. In Python programming, the if statement is used to control the execution of the program. Python does not support the use of switch statements, so when there are multiple conditions, you can only use elif for programming. The basic form of the if statement is:
If (conditional expression): conditional statement elif (other conditions): conditional statement else: conditional statement
Example:
A = 1if type (a) = = int: # determine whether an is plastic print ('is plastic') # if an is plastic, execute the conditional statement elif type = = float: # determine whether an is floating-point print ('floating-point') # if an is floating-point Execute the conditional statement else: # any type of print except shaping floating point ('') # execute the conditional statement # output result: for shaping 1.1 pass statement
The if statement cannot be empty. You don't want to execute anything in the statement block after the colon. You can use the pass statement to avoid errors. Example:
A = 0if a = 0: passelse: print ('hello') print (' end') # output result: end2, Python for loop statement
The for loop is used to iterate through items of any sequence, such as strings or lists. The for loop judges one condition at a time. Example of dictionary loop traversal:
Person = {"name": "mj", "age": 31, "hobby": "dance"} # get all the key value values in the dictionary for iMagne v in person.items (): print (I) print (v)
# output result:
Name
Mj
Age
thirty-one
Hobby
Dance
2.1 for nested Loop
A nested loop is a loop within a loop, and the inner loop is executed every time the outer loop is iterated. Example:
# use for to print the multiplication table for i in range (1): for j in range (1): print ("{} * {} = {}" .format), end='') print () ""
# output result:
1-1-1
1 / 2 / 2 / 2 / 2 / 4
1 "3" 3 "3" 3 "3" 6 3 "3" 9
1 "4" 4 2 "4" 8 3 "4" 12 4 "4" 16
1 "5" 5 "5" 10 3 "5" 15 4 "5" 20 5 "5" 25
1 "6" 6 "6" 12 3 "6" 18 4 "6" 24 5 "6" 30 6 "6" 36
1 "7" 7 "7" 14 3 "7" 21 4 "7" 28 5 "35 6" 7 "42 7" 7 "49
1 "8" 8 "8" 16 3 "8" 24 4 "8" 32 5 "8" 40 6 "8" 48 7 "8" 56 8 "8" 64
1'9'9 2'9 18 3'9 27 4'36 5'9 45 6'54 7'63 8'72 9'9 81
"
3. Python while loop statement
The while loop execution statement can be a single statement or a block of statements, and we can execute a set of statements as long as the condition is true. If the conditional judgment statement is always true, the loop will execute indefinitely, for example:
While (1): print (missing)
Output result:
Miss
Miss
Miss
...
"
3.1 while loop nesting
Use the while statement to print the ninety-nine multiplication table example:
I = 1while (I
