Xiang Wang @ 2016-09-05 12:48:47
- islower
- isupper
- istitle
'a,b,c'.split(',',1) # 只拆分一次
string.digits # '0123456789'
string.ascii_letters
string.ascii_lowercase
string.ascii_uppercase
<string>.count('w') # 查看字符串里面字符的数量
'a'.strip() # 把前后空格，换行，tab删除
'a'.strip('we') # 把前后的 w 和 e 删除。 而不是把前后的 'we' 删除
- basic formatting 基础
year = 2015; event = 'Referendum'
f'Results of the {year} {event}'
yes_votes = 42_572_654
no_votes = 43_132_495
percentage = yes_votes/(yes_votes + no_votes)
'{:-9} YES votes {:2.2%}'.format(yes_votes, percentage)
' 42572654 YES votes 49.67%'
'We are the {} who say "{}!"'.format('knights', 'Ni')
'{0} and {1}'.format('spam', 'eggs')
old "%s %r" % (Data(), Data())
new '{0!s} {0!r}'.format(Data(), Data())
- Numbers
old '%d' % 42
new '{:d}'.format(42)
old '%f' % 3.14159
new '{:f}'.format(3.14159)
- padding numbers
old '%4d' % 32
new '{:4d}'.format(32)
output ' 42'
old '%06.2f' % 3.14159
new '{:06.2f}'.format(3.14159) # 第一个数字代表长度，第二个代表精度
output '003.14'
old '%04d' % 42
new '{:04d}'.format(42)
output '0042'
- to be continued