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In our programming process , You need to traverse various data , For example, traversing a string , list , aggregate , Dictionaries , Tuples and so on ,
At this time, it is often necessary to use circular statements for processing .
python Loop statements mainly include for,while Two expressions
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for variable in iter_object
test_module
variable： by Customize a temporary variable
iter_object: Is an iterable object
test_module: It is the processing module of the program
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print('console'.center(50,'-'))
# Traverse the list
x = [1,2,3,4]
for x_index in x:
print(x_index)
print('*'*20)
# Traversal string
x = 'hello,world'
for y_index in x:
print(y_index)
print('*'*20)
# Ergodic dictionary
x = {
'name':'xu','age':18}
for x,y in x.items():
print(x,y)
print('*'*20)
#1+2+3+...+100 Methods
# Use range Generate a 1 To 100 Sequence
sum = 0
for rax in range(1,101):
sum+=rax
print(sum)
---------------------console----------------------
1
2
3
4
********************
h
e
l
l
o
,
w
o
r
l
d
********************
name xu
age 18
********************
5050
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while Cycle is python Another way of cycling
The format is ：
while condition:
test_module
condition: Is conditional control
test_module: The running module of the cycle
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# Infinite loop
print('console'.center(50,'-'))
while True: # When the gear condition is true , The statement indented by the space below will be executed consistently
print(' Infinite loop ')
---------------------console----------------------
Infinite loop
Infinite loop
Infinite loop
...
#1+2+3+...+100 Methods
print('console'.center(50,'-'))
x = 1
sum = 0
while x<=100: # When the conditions are met, the while Code inside , If the condition is not satisfied, the loop will jump out , To perform the
sum+=x
x+=1
print(sum)
---------------------console----------------------
5050
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break Statements are often used in the process of loop statements in combination with conditional control statements
perform break Statement will jump out of the entire loop statement
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print('console'.center(50,'-'))
for ins in range(1,10):
if ins==5: # When the conditions are met, the break sentence , The break The following code will not execute , Jump out of the entire loop code
print(' I'm ready to jump out of the loop ')
break
print(ins)
print(' I jumped out of the loop ')
---------------------console----------------------
1
2
3
4
I'm ready to jump out of the loop
I jumped out of the loop
-------------
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continue sentence Statements are often used in the process of loop statements in combination with conditional control statements
continue sentence Statement will jump out of the current loop , But it won't jump out of the whole cycle
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print('console'.center(50,'-'))
for ins in range(1,10):
if ins==5: # When the conditions are met, the continue sentence , The continue The following code will not execute , Continue the next new cycle
print(' I'm ready to jump out of the current cycle ')
continue
print(ins)
print(' I jumped out of the loop ') # Execute after the loop is completed
---------------------console----------------------
1
2
3
4
I'm ready to jump out of the current cycle
6
7
8
9
I jumped out of the loop
