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python条件与循环的复用 #85

Open anancds opened 4 years ago

anancds commented 4 years ago

expression1 if condition else expression2 for item in iterable 相当于：

for item in iterable: if condition: expression1 else: expression2

anancds commented 4 years ago

而如果没有 else 语句，则需要写成：expression for item in iterable if condition

anancds commented 4 years ago

[(xx, yy) for xx in x for yy in y if xx != yy] 相当于：

l = [] for xx in x: for yy in y: if xx != yy: l.append((xx, yy))