1、自定义字符串的count函数
>>> s = "Abcdb"
>>> s.count("b")
2
>>> s.count("bc")
1
>>> s.count("bd")
0
>>>
#可以包含重叠的字符
def str_count(string,sub_str):
if (not isinstance(string,str)) or (not isinstance(sub_str,str)):
return "string或sub_str不是字符串类型"
sub_count = 0
sub_len = len(sub_str)
#遍历
for i in range(len(string)):
if string[i:i+sub_len] == sub_str:
sub_count += 1
return sub_count
print(str_count("Abcbcb","b"))
print("Abcbcb".count("b"))
print(str_count("Abcbcb","bc"))
print("Abcbcb".count("bc"))
print(str_count("bcbcb","bcb"))
print("Abcbcb".count("bcb"))
print(str_count("bcbcb123","123"))
print("bcbcb123".count("123"))
print(str_count("bcbcb123",int("123")))
print(
