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python for循环的复合语句

 

有以下几种方式:

复制代码
    # nested if
    for l in lines:
        if l.startswith('example'):
            body
    # continue,to put an accent on exceptional case
    for l in lines:
        if not l.startswith('example'):
            continue
        body
    # hacky way of generator expression
    # (better than comprehension as does not store a list)
    for l in (l for l in lines if l.startswith('example')):
        body()
# 或者
for l in [l for l in lines if l.startswith('example')]:
statements
# and its named version def gen(lines): return (l for l in lines if l.startswith('example')) for line in gen(lines): body # functional style for line in filter(lambda l: l.startswith('example'),lines): body()
复制代码

值得注意的是下面这种形式python语法中不存在,会报错:

    for line in lines if line.startswith('example'):
        statements

 

posted @   点点米饭  阅读(571)  评论(0编辑  收藏  举报
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