python for循环的复合语句
有以下几种方式:
# 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()
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
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