python小错误笔记本

1.TypeError: unsupported operand type(s) for -: 'list' and 'set'

解决办法：list与dict不能做减法运算，必须同类型，可以改为

dict1 = dict op set(list)

2.UnicodeDecodeError: 'gbk' codec can't decode byte 0xe9 in position 7581: illegal multibyte sequence

打开文件的时候要注意编码问题

几种常见的编码方式

gbk
gb2312
gb18030
utf-8
utf-16
utf-32
ISO-8859-1

f = open(item,"r",encoding='ISO-8859-1')
3.

# p中元素的个数与a中元素个数不相同
# a and p must have same size
>>> np.random.choice([1, 3, 6, 2], 3, p = [0.1])
Traceback (most recent call last):
  File "", line 1, in 
  File "mtrand.pyx", line 1137, in mtrand.RandomState.choice
ValueError: a and p must have same size

# p中的元素之和不为1的时候
>>> np.random.choice([1, 3, 6, 2], 3, p = [0.1, 0.2, 0.5, 0.4])
Traceback (most recent call last):
  File "", line 1, in 
  File "mtrand.pyx", line 1141, in mtrand.RandomState.choice
ValueError: probabilities do not sum to 1

# p值设置正确
>>> np.random.choice([1, 3, 6, 2], 3, p = [0.1, 0.2, 0.4, 0.3])
array([1, 2, 2])

4.tf.matmul报错Shape must be rank 2 but is rank 1

进行matmul操作时两个矩阵的维度出错，导致无法进行操作

5.