Question

这是用于打印列表中存在的最低正整数的代码。 break语句不起作用，循环无限运行。

  list = []

n=1

print("enter array")
for i in range (5) :
    a=(int(input()))
    list.append(a)

while n<4 :
    for i in range (5) :
        if(list[i]== n):
            n=n+1
            continue
        else:
            print("the number should be" , n)
            break

Answer 1

break语句是指最内部的循环级别

下面的代码是一个无限循环：

while True:
    for i in range(10):
        if i == 5:
            break  # breaks the for, start a new iteration of the while loop

要打破while循环，您可以考虑使用这种标志

while True:
    broken = False
    for i in xrange(10):
         if i == 5:
             broken = True
             # break the for loop
             break
    if broken:
        # break the while loop
        break

for-else语句在这里也可能会有所帮助：

while True:
    for ...:
         if ...:
             # break the for loop
             break  # refers to the for statement
    else:
        # the breaking condition was never met during the for loop
        continue # refers to the while statement

    # this part only execute if the for loop was broken
    break # refers to the while statement

为什么代码中的break语句不起作用（Python）

1 个答案: