python实用语法总结

1、字符串数组转成float并保留3位小数

	import numpy as np
	data = ['1.04545677','2.012411','3.41521552']
	data = np.around(np.array(data, dtype=float),decimals=3).tolist()
	print(data)
	
	》》[1.045, 2.012, 3.415]

2、python3 输出提示如下错误：

python3 'ascii' codec can't encode characters in position 0-2: ordinal not i

解决方案：

import sys
import codecs
sys.stdout = codecs.getwriter("utf-8")(sys.stdout.detach())