Python学习笔记 DAY11

字符串

查找

count(sub[,start[,end]])

find(sub[,start[,end]]) rfind(sub[,start[,end]])

index(sub[,start[,end]]) rindex(sub[,start[,end]])

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("贵")
-1
x.rfind("贵")
-1
x.index("贵")
Traceback (most recent call last):
  File "<pyshell#7>", line 1, in <module>
    x.index("贵")
ValueError: substring not found

替换

expandtabs([tabsize=8])

replace(old,new, count=-1)

translate(table)

code = """
    print("I love python")
    print("I love python")"""
new_code = code.expandtabs(4)
print(new_code)

    print("I love python")
    print("I love python")
"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 python".translate(table)
'I love python'
"I love Python".translate(table)
'I love Python'
"I love FishC".translate(table)
'I love 6ish3'
"I love FishC".translate(str.maketrans("ABCDEFG", "1234567"))
'I love 6ish3'
"I love FishC".translate(str.maketrans("ABCDEFG", "1234567", "love"))
'I  6ish3'

判断