如何用python替换列表中的字符串？

# 假设要将列表中的字符串'old'替换为'new'
my_list = ['old', 'old', 'new', 'old', 'old']
new_list = ['new' if item == 'old' else item for item in my_list]
print(new_list)

['new', 'new', 'new', 'new', 'new']

# 假设要将列表中的字符串'old'替换为'new'
my_list = ['old', 'old', 'new', 'old', 'old']
for i in range(len(my_list)):
    if my_list[i] == 'old':
        my_list[i] = 'new'
print(my_list)

['new', 'new', 'new', 'new', 'new']