Detailed description of the string template (template) for pattern Development in Python, pythonpattern

Detailed description of the string template (template) for pattern Development in Python, pythonpattern

Detailed description of the string template for customizing pattern

The pattern of string. Template is a regular expression. You can overwrite the pattern attribute to define a new regular expression.

For example, use the new separator "{" and use {var} as the variable syntax.

Code:

# -*- coding: utf-8 -*-  ''''' Created on 2014.6.5  @author: Administrator  @edition : python 3.3.0, eclipse pydev '''  import string  t = string.Template('$var') print(t.pattern.pattern)  class MyTemplate(string.Template):   delimiter = '{{'   pattern = r'''''   \{\{(?:    (?P<escaped>\{\{) |  # Escape sequence of two delimiters    (?P<named>[_a-z][_a-z0-9]*)\}\}   |  # delimiter and a Python identifier    {(?P<braced>[_a-z][_a-z0-9]*)}\}\}  |  # delimiter and a braced identifier    (?P<invalid>)       # Other ill-formed delimiter exprs   )   '''    t2 = MyTemplate(''''' {{{{ {{var}} ''')  print('MATCHES: ', t2.pattern.findall(t2.template)) print('SUBSTITUTED: ', t2.safe_substitute(var='replacement')) 

Output:

  \$(?:    (?P<escaped>\$) |  # Escape sequence of two delimiters    (?P<named>[_a-z][_a-z0-9]*)   |  # delimiter and a Python identifier    {(?P<braced>[_a-z][_a-z0-9]*)}  |  # delimiter and a braced identifier    (?P<invalid>)       # Other ill-formed delimiter exprs   )    MATCHES: [('{{', '', '', ''), ('', 'var', '', '')] SUBSTITUTED:  {{ replacement 

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