替换列表中的字符串python

Question

我有一份清单，其中有三个单独的清单：

James =     ['Alvin Kamara','Alex Collins','Michael Thomas',
          'Adam Thielen','Evan Engram','Lamar Miller']

Ben =   ['Todd Gurley II','Royce Freeman','Larry Fitzgerald',
        'Cooper Kupp','Benjamin Watson','Robby Anderson']

Chris =     ['Dion Lewis','Rex Burkhead','Julio Jones',
          'Keenan Allen','Zach Ertz','Demaryius Thomas']

我想删除文本‘II'，如果你在“本”列表中看，会把’托迪古利II‘改为’托德格利‘。我目前的尝试是：

master_list = [James,Ben,Chris]

for owner in master_list:
    owner = [word.replace(' II','') for word in owner]

print(master_list[1])

但我得到的输出是：

['Todd Gurley II', 'Royce Freeman', 'Larry Fitzgerald', 'Cooper Kupp', 'Benjamin Watson', 'Robby Anderson']

Answer 1

在外层for循环中，可以更新owner变量的副本，但不要在列表中替换它。您可以将更新的owner变量添加到新列表中：

new_list = []
for owner in master_list:
    owner = [word.replace(' II','') for word in owner]
    new_list.append(owner)

print(new_list[1])

['Todd Gurley', 'Royce Freeman', 'Larry Fitzgerald', 'Cooper Kupp', 'Benjamin Watson', 'Robby Anderson']

或者，您可以在所有者列表上使用enumerate()，以便更新原来的master_list：

for i, owner in enumerate(master_list):
    owner = [word.replace(' II','') for word in owner]
    master_list[i] = owner

print(master_list[1])

['Todd Gurley', 'Royce Freeman', 'Larry Fitzgerald', 'Cooper Kupp', 'Benjamin Watson', 'Robby Anderson']

Answer 2

您可以使用re

import re
print([re.sub('\sII$', '', i) for i in master_list[1]])

输出：

['Todd Gurley', 'Royce Freeman', 'Larry Fitzgerald', 'Cooper Kupp', 'Benjamin Watson', 'Robby Anderson']

Answer 3

当您调用owner = [word.replace(' II','') for word in owner]时，您不是在更新master_list；而是在修改它的一个元素的副本。

您可以通过发出以下调用来循环和更新master_list

master_list[1] = [word.replace(' II','') for word in owner]

或者您可以引用一个新数组：

new_master_list = []
for owner in master_list:
    new_master_list.append([word.replace(' II', '') for word in owner])

print(new_master_list[1])