File "<stdin>", line 1, in <module> TypeError: f() argument after ** must be a mapping, not tuple 【错误分析】错误原因**匹配并收集在字典中所有包含位置的参数,但传递进去的却是个元祖。 所以修改传递参数如下: 复制代码代码如下: >>> args = {'a':1,'b':2,'c':3} >>> args['d'] ...
如上定义的函数,a,b为位置参数,*args为万能参数,name为关键字参数, c,为仅限关键字参数,再为c传参时,应该使用的方式为c=xxx,否则会报错 ---result--- func(2,3,4,5,name='taibai',10,age=18) SyntaxError: positional argument follows keyword argument func(2,3,4,5,name='taibai',c=10,age=18...
19 TypeError: print_args() argument after ** must be a mapping, not list 20 >>> print_args(**dict) 21 keyword arguments: {'Monday': '星期一', 'Tuesday': '星期二', 'Thursday': '星期三'} 22 # 这个用法同上面的道理一样,只是这里不能接受列表,仅限于字典 1. 2. 3. 4. 5. 6. ...
>>> args = (1,2,3,4) >>> f(**args) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: f() argument after ** must be a mapping, not tuple 1. 2. 3. 4. 5. 6. 7. 8. 【错误分析】错误原因**匹配并收集在字典中所有包含位置的参数,但传递进...
() argument after ** must be a mapping, not list In [93]: l3 Out[93]: [1, 2] In [95]: a Out[95]: 1 In [96]: f9(a,*l3) 1 1 2 In [97]: f9(x=5,*l3) --- TypeError Traceback (most recent call last) <ipython-input-97-f946fbd99d70> in <module>() ---> 1 f...
The argument may be a sequence (string, tuple or list) or a mapping (dictionary). print()输出 type(X)返回X的数据类型 open(f)打开一个文件f并返回文件类型的对象,和file()相似。 在python2.7.2 doc中可以查到每个函数的详细用法:function Built-in Functions abs() divmod() input() open() ...
>>> a is b False >>> a == b True >>> 4.强制2个字符串指向同一个对象 sys中的intern方法强制两个字符串指向同一个对象 '''sys中的intern方法强制两个字符串指向同一个对象''' import sys a = 'abc%' b = 'abc%' print(a is b) # True ...
mypy generates an error at line 19: Argument after ** must be a mapping, not "MyThing" Expected Behavior No error should be generated since it works at runtime. This has been discussed over in the Python Type School, and pyright has been updated to support this. Your Environment Mypy ve...
function. If repr is true, the field will be included in the object's repr(). If hash is true, the field will be included in the object's hash(). If compare is true, the field will be used in comparison functions. metadata, if specified, must be a mapping ...
After being "interned," many variables may reference the same string object in memory (saving memory thereby). In the snippets above, strings are implicitly interned. The decision of when to implicitly intern a string is implementation-dependent. There are some rules that can be used to guess ...