使用 for 循环打印名称

Question

president = [('D. Trump',2017), ('Barack Obama',2009), ('B. Clinton',1993), 
             ('George W. Bush',2001)]

max_w = president[0][1]
min_w = president[0][1]

for word in president:

    if word[1] > max_w:
        max_w = word
    elif word[1] < min_w:
        min_w = word   

print(max_w, min_w)

为什么 max_w 和 min_w 是一个元组？ 应该是int吗？？

Answer 1

我认为你想要在这些条件中max_w = word[1]和min_w = word[1] 。

或者，你可以这样写：

for name, year in president:
    if year > max_w:
        max_w = year
    if year < min_w:
        min_w = year

或者保存初始化并执行此操作（甚至更好的 IMO）：

max_w = max(year for name, year in president)
min_w = min(year for name, year in president)