python 文字列のいろいろ

string examples.py

# combine
'foo' + 'bar' # foobar
'foo' 'bar' # foobar

# split
'hello    world'.split() # ['hello', 'world']
'|foo|bar|'.split('|') # ['', 'foo', 'bar', '']
'alice, bravo, scot, tiger'.split(',', 2) # ['alice, 'bravo', 'scot, tiger']

# ゼロ埋め
'%03d'%(10) # 010

# last index of
'/hoge/fuga'.rfind('/') # 5

# ~with
'red'.startswith('s') # True
'blue'.endswith('e') # True

# substring
'hoge'[-2:] # ge
'fuga'[1:] # uga
'scott'[2:4] #ot
'tigger'[:-3] # tig

# strlen
len('hoge') # 4

# formatting
'this is %s'%('pen') # this is pen
'this is %(item)s. %(item)s is %(color)s'%{'item':'pen','color':'red'} # this is pen. pen is red

# centering
'foo'.center(9, '_') # ___foo___

# trim
' foo bar '.strip() # foo bar

# read lines
import StringIO

txt = '''aaa
bbb
ccc
ddd'''

buf = StringIO.StringIO(txt)

for line in buf:
  print line[:-1]

# aaa
# bbb
# ccc
# ddd