count()方法返回出现在范围内串子数range [start, end]。可选参数的start和end都解释为片符号。
语法
以下是count()方法的语法:
str.count(sub, start= 0,end=len(string))
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参数
- sub -- 这是子串用来进行搜索。
- start -- 搜索从这一索引。第一个字符从0开始的索引。默认情况下搜索从0开始的索引。
- end -- 搜索从该索引结束。第一个字符从0开始的索引。默认情况下搜索结束的最后一个索引。
返回值
此方法返回集中在长度宽度的字符串。
例子
下面的例子显示了count()方法的使用。
#!/usr/bin/python
str = "this is string example....wow!!!";
sub = "i";
print "str.count(sub, 4, 40) : ", str.count(sub, 4, 40)
sub = "wow";
print "str.count(sub) : ", str.count(sub)
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当我们运行上面的程序,它会产生以下结果:
str.count(sub, 4, 40) : 2
str.count(sub, 4, 40) : 1
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