字符串-Ⅱ
>>> x = "上海自来水来自海上">>> x.count("海")
2
>>> x.count("海", 0, 5)
1
>>> x.find("海")
1
>>> x.rfind("海")
7
>>> x.find("龟")
-1
>>> x.index("龟")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: substring not found
>>> # 替换
>>> code = """
... print("I love FishC.")
... print("I love my wife.")"""
>>> new_code = code.expandtabs(4)
>>> print(code)
print("I love FishC.")
print("I love my wife.")
>>> print(new_code)
print("I love FishC.")
print("I love my wife.")
>>> "在吗！我在你家楼下，快点下来！！".replace("在吗", "想你")
'想你！我在你家楼下，快点下来！！'
>>> table = str.maketrans("ABCDEFG", "1234567")
>>> "I love FishC.com".translate(table)
'I love 6ish3.com'
>>> "I love FishC.com".translate(str.maketrans("vcCDEFG", "1234567", "love"))
'I6ish3.2m'
>>> "I love FishC.com".translate(str.maketrans("vcCDEFG", "1234567"))
'I lo1e 6ish3.2om'
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[1]