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 using the globals(), locals(), or the inspect module. Let's dive into ...
The variable name: x In the end, I would like to infer that even though it is possible to get the variable name as a string in Python, it should not be your go-to in every scenario. A variable is not one of the objects that can have canonical names. On top of that, the names...
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...
Strings can beconcatenatedto build longer strings using the plus sign and also they can bemultipliedby a number, which results in the continuous repetition of the string as many times as the number indicates. Also, if we want to find out thelengthof the string, we simply have to use thelen...
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 ...
bvalue = longstringimportdmPython conn = dmPython.connect(user='SYSDBA', password='***', server='localhost', port=51236) cursor = conn.cursor()try:#清理测试环境cursor.execute("select object_id from all_objects where object_type='TABLE' and OBJECT_NAME='BIG_DATA';") big...
1NameError: name 'pirnt' is not defined2NameError: name 'sayhi' is not defined3NameError: name 'pd' is not defined 错误示例1：1pirnt('hello world')2# 错误原因：print拼写错误。错误示例2：1sayhi3def sayhi:4 pass5# 错误原因：在函数定义之前对函数进行调用。错误示例3：1pd.read_excel(r'...
# Variable name and value as stringsvariable_name="dynamicVar"value=42# Constructing and executing the string as Python codeexec(f"{variable_name} = {value}")# Access and print the newly created variableprint(dynamicVar) In our code, we start by defining two strings:variable_name, which is...
下面这张图是string模块中中的代码。 z = ''.join((random.choice(x) for i in range(1000)))的含义是:从x中随机选出1000个字符(每次选一个,选了1000次),每个字符之间用空字符串''进行拼接,组成一个字符串,再赋值给z。 d[ch] = d.get(ch, 0) + 1 的含义是:若字典d中没有ch,则将ch作为键...
driver.get("http://www.python.org")assert"Python"indriver.title elem = driver.find_element_by_name("q") elem.clear() elem.send_keys("pycon") elem.send_keys(Keys.RETURN)assert"No results found."notindriver.page_source driver.close() ...