Python字符串常用操作

目录

1. x.replace()

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1. x.replace()

替换操作

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self.label_files[ds] = [x.replace('images', 'labels_with_ids').replace('.png', '.txt').replace('.jpg', '.txt')
                                for x in self.img_files[ds]]

设置替换的个数

String.replace(old,new,count) 将字符串中的old字符替换为New字符，count为替换的个数，默认为全部替换

str = 'hello,world,hello'
 
print(str.replace('hello','Hello',1))

输出：

Hello,world,hello 

2. x.center()

a = 'python'
print(a.center(30,'*'))

输出：

************python************

3. x.join()

name = ['a','b','c','d']
print('-'.join(name))

输出：

a-b-c-d