利用程序重定向输出为日志文件

import sys
import time
import random as rd

f = open("d:/a.txt",'w')
old_fd = sys.stdout
sys.stdout = f

i = 1
while(1):
    if i >1000:
        break
    i +=1
    tm= time.localtime()
    time.sleep(0.01)
    # 2019-7-27  19:15:54 38.1961 35.4304 36.1544
    print("{}-{}-{}  {}:{}:{} {:.4f} {:.4f} {:.4f}".format(tm.tm_year,tm.tm_mon,tm.tm_mday,
                                              tm.tm_hour,tm.tm_min,tm.tm_sec,
                                              rd.uniform(30,40),rd.uniform(30,40),rd.uniform(30,40)))
sys.stdout = old_fd
f.close()

import sys

csv = open("d:/test.csv","a")
old_fd = sys.stdout
sys.stdout = csv
print("姓名","学号","年龄",sep=",")
print("egon","17096218",18,sep=",")
print("egon","17096218",18,sep=",")
print("egon","17096218",18,sep=",")

sys.stdout = old_fd
print("hello World")
csv.close()

import sys

csv = open("d:/test.csv","a")

print("姓名","学号","年龄",sep=",",file=csv)
print("egon","17096218",18,sep=",",file=csv)
print("egon","17096218",18,sep=",",file=csv)
print("egon","17096218",18,sep=",",file=csv)

csv.close()