python package install error and little code bugs

「爱情、让人受尽委屈。」 2023-08-17 16:37 100阅读 0赞

### When you install packages using setup.py, the error: ###

(py37) C:\Users\weda\Phd\python packages\visibility_graph-0.4>python setup.py install
    Traceback (most recent call last):
    File "setup.py", line 11, in 
    long_description=readme(),
    File "setup.py", line 5, in readme
    return f.read()
    File "C:\Users\weda\AppData\Local\Continuum\anaconda3\envs\py37\lib\encodings\cp1252.py", line 23, in decode
    return codecs.charmap_decode(input,self.errors,decoding_table)[0]
    UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in position 1725: character maps to

Here's the solution:  [stackoverflow][]

--------------------

### The difference of ndarray declare. ###

a = np.array([0,0,24])
    a.shape
    (3,)
    a
    array([ 0,  0, 24])

a = np.array((1,2))
    a
    array([1, 2])
    a.shape
    (2,)

There's no difference of passing parameter in () or \[\] format. And the first parameter represent the data value.

`numpy.``array`(*object*, *dtype=None*, *copy=True*, *order='K'*, *subok=False*, *ndmin=0*)

a = np.zeros([0,0,24])
    a.shape
    (0, 0, 24)
    a
    array([], shape=(0, 0, 24), dtype=float64)

`numpy.``zeros`(*shape*, *dtype=float*, *order='C'*); The first parameter is shape with \[\].

The problem when converting list into ndarray: [list长度不规则][list]

--------------------

另一个小问题，赋值问题，a = a.tolist(), dataframe = dataframe.drop(\[count\]); 这些函数返回新的值，需要重新赋值。

list.remove(), the parameter is the value of deleted item and cannot be the index. Otherwise, you need to use 'del' function or 'pop' function. From [here][].

转载于:https://www.cnblogs.com/dulun/p/11535756.html

[stackoverflow]: https://stackoverflow.com/questions/49640513/unicodedecodeerror-charmap-codec-cant-decode-byte-0x9d-in-position-x-charac?rq=1
[list]: https://www.cnblogs.com/yxzfscg/p/5061864.html
[here]: http://outofmemory.cn/code-snippet/37147/python-remove-list-element-with-index