python - break和continue

break

终止整个循环:当循环或判断执行到break语句时,即使判断条件为True或者序列尚未完全被历遍,都会跳出循环或判断

for i in xrange(10):
    print(i)
    if i == 8:
        break
print('end')

执行:
C:\Python27\python.exe D:/Python/type-of-data.py
0
1
2
3
4
5
6
7
8
end

Process finished with exit code 0

continue

跳出当次循环

当循环或判断执行到continue语句时,continue后的语句将不再执行,会跳出当次循环,继续执行循环中的下一次循环

for i in xrange(10):
    if i ==3:
        print('lalalalalalala')
        continue
    print(i)

print('end')

执行:
C:\Python27\python.exe D:/Python/type-of-data.py
0
1
2
lalalalalalala
4
5
6
7
8
9
end

Process finished with exit code 0

总结:

continue 语句跳出本次循环,只跳过本次循环continue后的语句

break 语句跳出整个循环体,循环体中未执行的循环将不会执行

for i in xrange(10):
    if i ==3:
        print('lalalalalalala')
        continue
    print(i)
    if i == 8:
        break
print('end')

执行:
C:\Python27\python.exe D:/Python/type-of-data.py
0
1
2
lalalalalalala
4
5
6
7
8
end

Process finished with exit code 0