大约有 20,000 项符合查询结果（耗时：0.0332秒） [XML]
UnboundLocalError on local variable when reassigned after first use
The following code works as expected in both Python 2.5 and 3.0:
12 Answers
12
...
Getting attributes of a class
I want to get the attributes of a class, say:
18 Answers
18
...
Significance of a .inl file in C++
...finitions of inline functions.
For definitions of function templates.
In both cases, I put the declarations of the functions in a header file, which is included by other files, then I #include the .inl file at the bottom of the header file.
I like it because it separates the interface from the im...
Accessing private member variables from prototype-defined functions
Is there any way to make “private” variables (those defined in the constructor), available to prototype-defined methods?
...
How to efficiently compare two unordered lists (not sets) in Python?
a & b should be considered equal, because they have exactly the same elements, only in different order.
10 Answers
...
Applying function with multiple arguments to create a new pandas column
I want to create a new column in a pandas data frame by applying a function to two existing columns. Following this answer I've been able to create a new column when I only need one column as an argument:
...
Check if two unordered lists are equal [duplicate]
...
Python has a built-in datatype for an unordered collection of (hashable) things, called a set. If you convert both lists to sets, the comparison will be unordered.
set(x) == set(y)
Documentation on set
EDIT: @mdwhatcott points out t...
Rename Pandas DataFrame Index
...header, with a DateTime index. I want to rename the index and column name, but with df.rename() only the column name is renamed. Bug? I'm on version 0.12.0
...
Find integer index of rows with NaN in pandas dataframe
...
For DataFrame df:
import numpy as np
index = df['b'].index[df['b'].apply(np.isnan)]
will give you back the MultiIndex that you can use to index back into df, e.g.:
df['a'].ix[index[0]]
>>> 1.452354
For the integer index:
df_index = df.index.values.tolist()
[d...
Is there a way to provide named parameters in a function call in JavaScript?
...
ES2015 and later
In ES2015, parameter destructuring can be used to simulate named parameters. It would require the caller to pass an object, but you can avoid all of the checks inside the function if you also use default parameters:
myFunction({ param1 : 70, param2 : 175});
func...