# 定义一个对象classMyClass:def__init__(self):self.attr='Hello'obj=MyClass()# 方法一:使用is not NoneifobjisnotNone:print('Object exists')else:print('Object does not exist')# 方法二:使用hasattrifhasattr(obj,'attr'):print('Attribute exists')else:print('Attribute does not exist') 1. ...
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: 代码语言:javascript 复制 1FileNotFoundError:File b'E:\test\test_data.csv'does not exist 错误示例: 代码语言:javascript 复制 1pd.re...
TypeError: ‘tuple’ object does not support item assignment 说明:无法修改元组元素。可能的原因: 尝试通过索引修改元组元素。解决方案:将元组转换为列表或移除修改操作。 ValueError: could not convert string to float:‘12.2s’ 说明:无法将字符串转换为浮点数。可能的原因: float() 函数接受了非浮点字符串数...
23. TypeError: 'tuple' object does not support item assignment 尝试去修改元组的值。tuple不支持修改某个元素的值。 a = (1, 2, 3) a[0] = 10 # 尝试修改第一个元素 如何修改:用列表替换元组。 虽然我们不能把元组的某个元素替换,但如果这个元素是可变的,我们可以这样修改。 x = ([1, 2, 3],...
('status') if status == "successful": return OK elif status == "failed": return ERR else: cnt += 1 return ret class StartupInfo(object): """ Startup configuration information image: startup system software config: startup saved-configuration file patch: startup patch package feature_...
What this function should be doing is checking to try and get node.path and if this doesn't exist then gets node.fspath like described getattr(object, attribute_name, default_value). Let me know if this is where you are substituting to see success. Thanks...
headBucket(bucketName) # 返回码为2xx时,接口调用成功,否则接口调用失败 if resp.status < 300: print('Head Bucket Succeeded') print('Bucket exists') elif resp.status == 404: print('Head Bucket Failed') print('Bucket does not exist') else: print('Head Bucket Failed') print('status:', ...
if y_or_n == 'q': break 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 运行结果如下图所示。 2.FileNotFoundError异常及处理 使用文件时,一种常见的问题是找不到文件,我们来读取一个不存在的文件。 运行下面代码。 with open('text.txt') as file_object: # 读取文件text.txt ...
导致:TypeError: 'str' object does not support item assignment 正确地做法应该是: 7.字符串与非字符串连接 导致:TypeError: cannot concatenate 'str' and 'int' objects 字符串与非字符串连接时 必须把非字符串对象强制转换为字符串类型 或者使用字符串的格式化形式 ...
Bug report The following code works fine with Python 3.8 and 3.9 but starts failing with Python 3.10. It seems that zipfile.Path creates an entry in the zipfile.ZipFile object that does not exist in the underlying file and therefore make...