标签:metro bsp 元组 tom 可迭代对象 表达式 赋值 于平 format
>>> lax_coordinates = (33.9425, -118.408056)
拆包
>>> latitude, longitude = lax_coordinates >>> latitude 33.9425
还可以用*运算符把一个可迭代对象拆开作为函数的参数
>>> t = (20, 8) >>> quotient, remainder = divmod(*t) >>> quotient, remainder (2, 4)
ps:*运算符用于平行赋值,当然*前缀只能用在一个变量名前面,不过可以出现在赋值表达式的任何位置。
>>> a, b, *rest = range(5) >>> a, b, rest (0,1,[2, 3, 4]) >>> a, *body, c, d = range(5) >>> a, body, c, d (0, [1,2], 3, 4)
metro_areas = [ (‘Tokyo‘, ‘JP‘, 36.933, (35.689722, 139.691667)), (‘Delhi NCR‘, "IN", 21.935, (28.613889, 77.208889)), (‘Mexico City‘, "MX", 20.142, (19.43333, -99.133333)), (‘New York-Newark‘, "US", 20.104, (40.808611, -74.020386)), (‘Sao Paulo‘, "BR", 19.649, (-23.547778, -46.635833)), ] print(‘{:15}|{:^9}|{:^9}‘.format("", ‘lat.‘, ‘long.‘)) fmt = ‘{:15}|{:9.4f}|{:9.4f}‘ for name, cc, pop, (latitude, longitude) in metro_areas: # 将元组的最后一个元素拆包 if longitude <= 0: print(fmt.format(name, latitude, longitude))
输出
| lat. | long. Mexico City | 19.4333| -99.1333 New York-Newark| 40.8086| -74.0204 Sao Paulo | -23.5478| -46.6358
标签:metro bsp 元组 tom 可迭代对象 表达式 赋值 于平 format
原文地址:https://www.cnblogs.com/haoqirui/p/9943400.html