Python string replace function

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python String substitution replace function

replace(old, new, count)

• old, Old character or string
• new, New character or string
• count, Maximum replacement quantity , Count from the starting position , Replace all... By default
• Be careful ：replace Function to replace the string , Does not affect the original string

Example 1： Replace all... By default

s1 = '2019.10.30'
s2 = s1.replace('.', '-')
s2

'2019-10-30'

s1 # Does not affect the original string 

'2019.10.30'

Example 2： Specify replacement quantity

s1 = '2019.10.30'
s2 = s1.replace('.', '-',1)
s2

'2019-10.30'

Example 3： Replace string

s1 = '2019.10.30'
s2 = s1.replace('19', '20')
s2

'2020.10.30'

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