第一种情况直接下载安装即可，在cmd中，pip install xxx；第二种情况电脑中可能存在多个版本的Python，建议保留一个常用的即可。十、 FileNotFoundError 文件不存在报错信息：1FileNotFoundError: File b'E:\test\test_data.csv' does not exist错误示例：1pd.read_csv('E:\test\test_data.csv')2# 错误原因...
1UnboundLocalError:local variable's'referenced before assignment 错误示例: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 1s=123deftest():4s+=15print(s)67test()8# 错误原因:在函数内对未声明的全局变量s进行了自增操作。9# Python将变量s视为一个本地的局部变量,但该变量未初始化。 解决方法: ...
>>> variable = 123>>> print(varible)Traceback (most recent call last): File "<stdin>", line 1, in <module>NameError: name 'varible' is not defined代码块12345 在第 1 行，创建变量 variable；在第 2 行，此处将 variable 错误的拼写成 varible；变量 varible 还没有创建；在第 5 行，产生...
10.FileNotFoundError: [Errno 2] No such file or directory: 'non-exist.dat' 尝试访问不存在的文件或者目录。原因:文件名称或者路径出错,或者文件的确不存在。 d = open("non-exist.dat").read() # non-exist.dat 在当前目录下面不存在 11.ModuleNotFoundError: No module named 'requests' 尝试导入一...
Variables defined inside the function only exist as long as the function is being executed. So, a variable inside a function exists only while the function runs. After the function ends, the variable is removed. Example: Python 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 ...
Here, the variable lang_name is given the value “python”. Python Private Variables In Python, ‘Private’ instance variables can’t be accessed except inside an object; they do not practically exist. However, most Python coders use two underscores at the beginning of any variable or method ...
# invalid funciton calldeftest_ftn():return"Test function"print(test_ft())# calling the the function which does not exist# printing invalid varaiblename ="Zeeshan Afridi"print(Name)# printing variable `Name` which does not exist 两者都是 Python 中 NameError 的原因,因为在第一个示例中,我们...
Please chack.") if not os.path.exists(file_path_real): logging.error("File does not exist.") return ERR, "" if is_config_file not in [True, False]: logging.error("The flag of config file is invalid. " "is_config_file = {}".format(is_config_file)) return ERR, "" sha256_...
These different namespaces are isolated. Hence, the same name that may exist in different modules does not collide. Modules can have variousfunctionsandclasses. Alocal namespaceis created when a function is called, which has all the names defined in it. ...
## getting operator precedence wrong ## This does not calculate the average correctly x = 3 y = 4 average = x + y / 2 print(average) ## using the wrong variable name nums = 0 for num in range(10): num += num ## indenting a block to the wrong level sum_squares =...