无法在 python 中更改大小写

Question

在下面的代码中，我想根据 openningline 的大小写更改 End 的大小写。但是，它不起作用，即无论 openningline 的情况如何，End 总是 End，而不是 end 或 END。

我这里做错了什么？

class SyntaxElement:
    def __init__(self, openningline, closingline):
        self.openningline = openningline
        self.closingline = closingline
    def match(self, line): 
        """ Return (indent, closingline) or (None, None)"""
        match = self.openningline.search(line)
        if match:
            indentpattern = re.compile(r'^\s*')
            variablepattern = re.compile(r'$\{(?P<varname>[a-zA-Z0-9_]*)\}')
            indent = indentpattern.search(line).group(0)
            if self.openningline.pattern.istitle():
              closingline = self.closingline.title()
            elif self.openningline.pattern.islower():
              closingline = self.closingline.lower()
            elif self.openningline.pattern.isupper():
              closingline = self.closingline.upper()
            else:
              closingline = self.closingline

            
            # expand variables in closingline
            while True:
                variable_match = variablepattern.search(closingline)
                if variable_match:
                    try:
                        replacement = match.group(variable_match.group('varname'))
                    except:
                        print("Group %s is not defined in pattern" % variable_match.group('varname'))
                        replacement = variable_match.group('varname')
                    try:
                        closingline = closingline.replace(variable_match.group(0), replacement)
                    except TypeError:
                        if replacement is None:
                            replacement = ""
                        closingline = closingline.replace(variable_match.group(0), str(replacement))
                else:
                    break
        else:
            return (None, None)
        closingline = closingline.rstrip()
        return (indent, closingline)
            
        
def fortran_complete():

    syntax_elements = [
        SyntaxElement(re.compile(r'^\s*\s*((?P<struc>([A-z0-9]*)))\s*((?P<name>([a-zA-Z0-9_]+)))', re.IGNORECASE),
                      'End ${struc} ${name}' ),
    ]

Answer 1

您似乎希望 openningline 成为 re。因此，当您使用 self.openningline.pattern.istitle() 时，您测试的是正则表达式模式，而不是您尝试与 re 匹配的行。大多数情况下，istitle()、islower() 和 isupper().

的正则表达式模式将为 False

我不能完全理解你想要做什么，但也许你应该使用 line.istitle() 等等。

Answer 2

您没有使用正则表达式来匹配任何内容。应该是：

matched = self.openningline.search(line).group(0)
if matched.istitle():
    closingline = closingline.title()
elif matched.isupper():
    closingline = closingline.upper()
elif matched.islower():
    closingline = closingline.lower()

无法在 python 中更改大小写

can not change case in python

python

case

python-re