As we know that else can be used with if statement in Python and other programming languages (like C, C++, Java, etc).

我们知道， else可以与Python和其他编程语言(如C，C ++，Java等)中的if语句一起使用。

In Python, we can use else with for/while to determine whether for/while loop is terminated by a break statement or not i.e. else statement used with for/while is executed only when for/while is not terminated by break statement.

在Python中，我们可以将else与for / while一起使用来确定for / while循环是否由break语句终止，即else for / while所使用的语句仅在for / while不由break语句终止时才执行。

Example 1:

范例1：

# python program to demosntrate
# example of "else with for/while"
# using else with for
for num in range(1, 10):
print(num)
else:
print("Full loop successfully executed")
# using else with while
string = "Hello world"
counter = 0
while(counter < len(string)):
print(string[counter])
counter += 1
else:
print("Full loop successfully executed")

Output:

输出：

1
2
3
4
5
6
7
8
9
Full loop successfully executed
H
e
l
l
o
w
o
r
l
d
Full loop successfully executed

Example 2:

范例2：

# python program to demosntrate
# example of "else with for/while"
# using else with for
for num in range(1, 10):
print(num)
if(num==5):
break
else:
print("Full loop successfully executed")
# using else with while
string = "Hello world"
counter = 0
while(counter < len(string)):
print(string[counter])
if string[counter] == ' ':
break
counter += 1
else:
print("Full loop successfully executed")

Output:

输出：

1
2
3
4
5
H
e
l
l
o

Consider both of the above examples, when we used a break statement – else statement is not executed and we didn't use break statement – else statement is executed.

考虑上面的两个示例，当我们使用break语句–不执行else语句，并且不使用break语句– else语句被执行时。

翻译自: https://www.includehelp.com/python/else-with-for-while-statement.aspx