你能"重新启动"Python循环的当前迭代吗？

Question

有没有办法实现这样的事情:

for row in rows:
    try:
        something
    except:
        restart iteration

Answer 1

您可以将try/except块放在另一个循环中,然后在成功时中断:

for row in rows:
    while True:
        try:
            something
            break
        except Exception: # Try to catch something more specific
            pass

Answer 2

您可以使行成为迭代器，并且仅在没有错误时才前进。

it = iter(rows)  
row = next(it,"")
while row:
    try:
        something
        row = next(it,"")
    except:
       continue

顺便提一句，如果您还没有，我会捕获除外中的特定错误，您并不想捕获所有内容。

如果您具有Falsey值，则可以使用object作为默认值：

it = iter(rows)
row, at_end = next(it,""), object()
while row is not at_end:
    try:
        something
        row = next(it, at_end)
    except:
        continue