详解Python中string模块除去Str还剩下什么

import string

s = 'The quick brown fox jumped over the lazy dog.'

print(s)
print(string.capwords(s))

$ python3 string_capwords.py

The quick brown fox jumped over the lazy dog.
The Quick Brown Fox Jumped Over The Lazy Dog.

#字符串模板

import string

values = {'var': 'foo'}

t = string.Template("""
Variable    : $var
Escape     : $$
Variable in text: ${var}iable
""")

print('TEMPLATE:', t.substitute(values))

s = """
Variable    : %(var)s
Escape     : %%
Variable in text: %(var)siable
"""

print('INTERPOLATION:', s % values)

s = """
Variable    : {var}
Escape     : {{}}
Variable in text: {var}iable
"""

print('FORMAT:', s.format(**values))

$ python3 string_template.py

TEMPLATE:
Variable    : foo
Escape     : $
Variable in text: fooiable

INTERPOLATION:
Variable    : foo
Escape     : %
Variable in text: fooiable

FORMAT:
Variable    : foo
Escape     : {}
Variable in text: fooiable

#字符串模板丢失.py

import string

values = {'var': 'foo'}

t = string.Template("$var is here but $missing is not provided")

try:
  print('substitute()   :', t.substitute(values))
except KeyError as err:
  print('ERROR:', str(err))

print('safe_substitute():', t.safe_substitute(values))

$ python3 string_template_missing.py

ERROR: 'missing'
safe_substitute(): foo is here but $missing is not provided

#字符串模板

import string


class MyTemplate(string.Template):
  delimiter = '%'
  idpattern = '[a-z]+_[a-z]+'


template_text = '''
 Delimiter : %%
 Replaced : %with_underscore
 Ignored  : %notunderscored
'''

d = {
  'with_underscore': 'replaced',
  'notunderscored': 'not replaced',
}

t = MyTemplate(template_text)
print('Modified ID pattern:')
print(t.safe_substitute(d))

$ python3 string_template_advanced.py

Modified ID pattern:

 Delimiter : %
 Replaced : replaced
 Ignored  : %notunderscored

#字符串模板_defaultpattern.py

import string

t = string.Template('$var')
print(t.pattern.pattern)

\$(?:
 (?P<escaped>\$) |        # two delimiters
 (?P<named>[_a-z][_a-z0-9]*)  | # identifier
 {(?P<braced>[_a-z][_a-z0-9]*)} | # braced identifier
 (?P<invalid>)          # ill-formed delimiter exprs
)

#字符串模板_newsyntax.py

import re
import string


class MyTemplate(string.Template):
  delimiter = '{{'
  pattern = r'''
  \{\{(?:
  (?P<escaped>\{\{)|
  (?P<named>[_a-z][_a-z0-9]*)\}\}|
  (?P<braced>[_a-z][_a-z0-9]*)\}\}|
  (?P<invalid>)
  )
  '''


t = MyTemplate('''
{{{{
{{var}}
''')

print('MATCHES:', t.pattern.findall(t.template))
print('SUBSTITUTED:', t.safe_substitute(var='replacement'))

$ python3 string_template_newsyntax.py

MATCHES: [('{{', '', '', ''), ('', 'var', '', '')]
SUBSTITUTED:
{{
replacement

#字符串常数.py

import inspect
import string


def is_str(value):
  return isinstance(value, str)


for name, value in inspect.getmembers(string, is_str):
  if name.startswith('_'):
    continue
  print('%s=%r\n' % (name, value))

$ python3 string_constants.py

ascii_letters='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW
XYZ'

ascii_lowercase='abcdefghijklmnopqrstuvwxyz'

ascii_uppercase='ABCDEFGHIJKLMNOPQRSTUVWXYZ'

digits='0123456789'

hexdigits='0123456789abcdefABCDEF'

octdigits='01234567'

printable='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQ
RSTUVWXYZ!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~ \t\n\r\x0b\x0c'

punctuation='!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~'

whitespace=' \t\n\r\x0b\x0c'