#==================================================================#首先需要导入两个文件import matplotlib.pyplot as pltimport numpy as np#================================================================== #======================================================
1.最简单的内置format函数: >>> format(1234567890,',') '1,234,567,890' 2.正则表达式: import re def formatNum(num): num=str(num) pattern=r'(\d+)(\d{3})((,\d{3})*)' while True: num,count=re.subn(pattern,r'\1,\2\3',num) if count==0: break return num if __name__=='
在运行yum时提示如下错误 There was a problem importing one of the Python modules required to run yum. The error leading to this problem was: No module named rpm 但是执行rpm命令可以成功.在网上查找了一些资料,有的讲说是python装了多个,或者当前Python版本过高. 一.通过命令whereis命令查询发现系统中只有一个Pytho