如何从可能的字符串列表中替换python中的字符串

s = "Hello world"
replacements = {"Hello": "Hi", "world": "there"}

for old, new in replacements.items():
    s = s.replace(old, new)

print(s)  # 输出: Hi there

import re

s = "Hello world"
replacements = {"Hello": "Hi", "world": "there"}

# 正则表达式匹配所有键，并替换为对应的值
pattern = re.compile("|".join(re.escape(key) for key in replacements.keys()))

def match_replacer(match):
    return replacements[match.group(0)]

s = pattern.sub(match_replacer, s)
print(s)  # 输出: Hi there

s = "Hello"
replacements = {"Hello": "Hi", "world": "there"}

s = replacements.get(s, s)  # 使用get来避免KeyError，如果s不在字典keys中就返回s
print(s)  # 输出: Hi

s = "abc"
replacements = str.maketrans({"a": "1", "b": "2", "c": "3"})
s = s.translate(replacements)
print(s)  # 输出: 123

def multiple_replace(s, replacements):
    for old, new in replacements.items():
        s = s.replace(old, new)
    return s

s = "Hello world"
replacements = {"Hello": "Hi", "world": "there"}
print(multiple_replace(s, replacements))  # 输出: Hi there