cars = ["audi", "bmw", "subaru", "toyota"] for car in cars: if car == "bmw": print(car.upper()) else: print(car.title()) # 条件测试即布尔值（bool）：值为 True 或 False 的表达式； # = assign, == equal; # !=, not equal; # > greater, < less, >= greater and equal, <= less and equal; # A and B, A and B all is True; # A or B, either A or B is True; # 为了改善可读性，可以在 and 和 or 的两边使用 (); # in, check if element in list; print(f"'suzuki' in cars is { 'suzuki' in cars}") # not in, check if element not in list; print(f"'suzuki' in cars is { 'suzuki' not in cars}") # condition statement age = 18 if age < 18: # print(f"Sorry, you are too young to vote, wait another {18 - age} years!") # print(f"Please registered to vote as soon as you turn 18") ... elif age <= 100: # print(f"Your age {age} is enough old to vote!") # print("Have you registered to vote yet?") ... else: # print(f"OMG, you are {age} years old, you are so lucky!") ... # False => 0, '', "", None, [], (), {} if 0 and "" and None and [] and () and {}: print("Those are False") else: print("False => 0, '', " ", None, [], (), {}")