Python number to string (%)

• Global function str

>>> str(123)
'123'
>>> str(1.23)
'1.23'

• %d

>>> 'a month has %d days'%30
'a month has 30 days'
>>> 'a big month has %d days,a small month has %d days'%(31,30)
'a big month has 31 days,a small month has 30 days'
>>> 'a big month has %10d days'%30
'a big month has 30 days'

notes ： use % The latter replaces the former %d
notes ：%d In the middle of the 10 The description length is 10,has There is already a space behind it .

• %f

>>> 'the number is %.1f'%1.23
'the number is 1.2'
>>> 'the number is %10.1f'%1.23
'the number is 1.2'

Be careful ：is There is already a space behind it .