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)

\$("htmlcode">

#字符串模板_newsyntax.py

import re
import string


class MyTemplate(string.Template):
  delimiter = '{{'
  pattern = r'''
  \{\{("htmlcode">

$ python3 string_template_newsyntax.py

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




格式化程序


这个Formatter类实现与format()方法str。它的功能包括类型强制、对齐、属性和字段引用、命名和位置模板参数以及特定于类型的格式选项。大多数时候format()方法是这些特性的更方便的接口，但是Formatter作为构建子类的一种方法，用于需要变体的情况下。


常数


这个string模块包括一些与ASCII和数字字符集相关的常量。




#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))




这些常量在处理ASCII数据时很有用，但是由于在某种形式的Unicode中遇到非ASCII文本越来越常见，因此它们的应用受到限制。




$ python3 string_constants.py

ascii_letters='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW
XYZ'

ascii_lowercase='abcdefghijklmnopqrstuvwxyz'

ascii_uppercase='ABCDEFGHIJKLMNOPQRSTUVWXYZ'

digits='0123456789'

hexdigits='0123456789abcdefABCDEF'

octdigits='01234567'

printable='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQ
RSTUVWXYZ!"#$%&\'()*+,-./:;<=>"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~'

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