运行 "Learn Python the Hard Way" 里的代码时出现的报错。代码：
1. from sys import argv
2. from os.path import exists
3.
4. script, from_file, to_file = argv
5.
6. print(f"Copying from {from_file} to {to_file}")
7.
8. # we could do these two on one line, how?
9. in_file = open(from_file)
10. indata = in_file.read()
11.
12. print(f"The input file is {len(indata)} bytes long")
13.
14. print(f"Does the output file exsit? {exists(to_file)}")
15. print("Ready, hit RETURN to continue, CTRL-C to abort.")
16. input()
17.
18. out_file = open(to_file, 'w')
19. out_file.write(indata)
20.
21. print("Alright, all done.")
22.
23. out_file.close()
24. in_file.close()
照抄书本在 Terminal 上输入的命令：
$ echo "This is a test file." > test.txt
$ cat test.txt
This is a test file.
$ python ex17.py test.txt new_file.txt
下面是 Terminal 给的提示：
Copying from test.txt to new_file.txt
Traback ( most recent call last):
File "ex17.py", line 10, in
indata = in_file.read()
UnicodeDecodeError: 'gbk' codec can't decode byte 0xff in position 0: illegal multibyte sequence
尝试把 'gbk' 编码改为 'UTF-8':
9. in_file = open(from_file, 'r', encoding = 'UTF-8')
Terminal 给出的提示
Copying from test.txt to new_file.txt
Traceback (most recent call last):
File "ex17.py", line 10, in
indata = in_file.read()
File "C:\Python36\lib\codecs.py", line 321, in decode
(result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte
求解：是什么导致这个 Error ？以及如何解决？
UnicodeDecodeError 解码错误，请先确认源文件的编码是什么，然后用对应的编码解码。如果是gb2312，encoding='gb18030'试试，
如果编码确认无误，还出现解码错误，那么一定是文件出现无法解码的乱码。此时1：去除文件中的乱码 ； 2：以字节方式读入，然后decode时
传入errors='ignore'忽略解码错误即可。强调一下，一定要先确认编码无误。
编码不对，改一下编码
import math
import codecs
xy_coordinate = [] # 转换后的XY坐标集
def millerToXY (lng, lat):
"""
经纬度转换为平面坐标系中的x,y 利用米勒坐标系
:param lng: 经度
:param lat: 纬度
:return:
"""
L = 6381372*math.pi*2
W = L
H = L/2
mill = 2.3
x = lng*math.pi/180
y = lat*math.pi/180
y = 1.25*math.log(math.tan(0.25*math.pi+0.4*y))
x = (W/2)+(W/(2*math.pi))*x
y = (H/2)-(H/(2*mill))*y
xy_coordinate.append((int(round(x)),int(round(y))))
return xy_coordinate
f = codecs.open('C:/Users/zcy98/Desktop/City.xlsx',mode = 'r',encoding = 'utf-8')
line = f.readline()
codes = []
while line:
a = line.strip('\n')
x = a[1]
y = a[2]
codes.append(millerToXY(x,y))
line = f.readline
f.close()
for i in codes:
print(i)