In Python Variables are just the labels that are pointing to the values. They don't carry any built-in metadata about their names. That's why there is no direct built-in method to get the variable name as a string. However, we can achieve this, by inspecting the environment such as ...
Astringis a Python data type that’s used to represent a piece of text. It’s written between quotes, either double quotes or single quotes and can be as short as zero characters, or empty string, or as long as you wish. Strings can beconcatenatedto build longer strings using the plus...
The following example makes use of the iteritems() function to get a variable name as a string in Python. 1 2 3 4 5 6 # Python 2 code x = 7 x = [ i for i, a in locals().iteritems() if a == x][0] print("The variable name:", x) The above code provides the followi...
我们需要的是eval()函数的反面:get_indentifier_name_missing_function() 将标识符名称('variable','dictionary',等)作为参数,并返回 包含标识符名称的字符串。 考虑以下现状:random_function(argument_data) 如果将标识符名称('function','variable','dictionary',etc)argument_data传递给random_function()(另一个标...
报错local variable 'pipe' referenced before assignment,需要对源码进行细微修改。如果配置报错,可以参考这篇文章:python 使用 textract 解析 pdf 时遇到 UnboundLocalError: local variable 'pipe' referenced before assignment,总结的比较全面。 代码语言:javascript ...
# This is a single-line comment."""This is a multiline string that also works as a multiline comment. """ 如果您的注释跨越多行,最好使用单个多行注释,而不是几个连续的单行注释,这样更难阅读,如下所示: """This is a good way to write a comment ...
f"some stuff here{avariable}"f"some other stuff{anothervar}" Python还有另一种使用.format()语法的格式化方式,你可以在第 17 行看到。有时候当我想对已经创建的字符串应用格式时,你会看到我使用它。我们稍后会更详细地讨论这个。 现在我们将输入一大堆字符串、变量和格式,并打印它们。你还将练习使用简短的...
Note python has this really weird error if you define local variable in a function same name as the global variable, program will promptUnboundLocalError. child class object overrides parent class methods input: classfruit:defprint(self):print('a')defeat(self):print('b')classapple(fruit):defpr...
4 'delete blanks around a string' 5 _end = len(str) 6 _start = 0 7 8 # delete the blanks at the beginning of the string 9 for i in range(_end): 10 if str[i] != ' ': 11 _start = i 12 break 13 else: 14 print 'invalid: The string is a blank string.' # if the st...
"""This is a multiline string that also works as a multiline comment. """ 如果您的注释跨越多行,最好使用单个多行注释,而不是几个连续的单行注释,这样更难阅读,如下所示: """This is a good way to write a comment that spans multiple lines. """ # This is not a good way # to write...