python字符串替換replace函數
replace(old, new, count)
- old,舊字符或字符串
- new,新字符或字符串
- count,最大替換數量,從起始位置開始計數,默認替換所有
- 注意:replace函數替換字符串,不影響原字符串
示例1:默認替換所有
s1 = '2019.10.30'
s2 = s1.replace('.', '-')
s2
'2019-10-30'
s1 # 不影響原字符串
'2019.10.30'
示例2:指定替換數量
s1 = '2019.10.30'
s2 = s1.replace('.', '-',1)
s2
'2019-10.30'
示例3:替換字符串
s1 = '2019.10.30'
s2 = s1.replace('19', '20')
s2
'2020.10.30'