#Python字符串操作
msg = "hello 123 WORLD"
#将字符串中的"WORLD"替换为"Python"
re_list = msg.replace("WORLD","Python")
#将整个字符串转换为小写
last_list = re_list.lower()
print("将字符串中的WORLD替换为Python,然后将整个字符串转换为小写:",last_list)
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