Can python reference a function of another file?

In python, you can reference the function of another file. Here is an example: First, the calling method in the same folder is as follows:

Call the function :

A.py:
def add(x,y):
    print('和为：%d'%(x+y))

B.py file:

import A
A.add(1,2)
 
###或者###
from A import add
add(1,2)

If not in a folder:

import sys
sys.path.append(r'E:\PythonProject\winycg')

' ''When python imports the module, it is searched in sys.path in order.

sys.path is a list that stores many paths in the form of strings.

To use the function in the A.py file, you need to first put its file path in sys.path'''

import A
 
a=A.A(2,3)
a.add()

Sometimes, it will prompt ## during execution #No module named "xxx", referring to the __init__.py file for modification still cannot achieve the desired effect. Therefore, in this case, the following methods have been tried to achieve the goal.

When the .py file to be referenced is not in the same folder as the file currently being executed, we can still implement it directly using the third line of code below. You can see that the first two lines are commented out.

#import sys
#sys.path.append(r'D:\Python27\Pythonfiles\HMM')
from Pythonfiles.HMM import M_matrix  ##引用M矩阵

The above M_matrix.py file converts the time series into a certain matrix form, which makes it easier for us to read different files and represent the M matrix into a file. At this time, the parameters can be called Refer to the following form:

def matrix(X):
    par = M_matrix.parameters(X)
    M = M_matrix.center(X, par[5], par[6], par[7], par[8], par[9])  # 获取转换后的M矩阵
    return M

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