Python:控制台和文本文件的标准输出，包括错误

Question

我想将 python 的输出打印到控制台和包含错误(如果有)的文本文件。

到目前为止，我的尝试是:

使用控制台:

# mystdout.py
# note that it has missing ) sign
print("hello


# in the terminal:
chmod a+x mystdout.py; ./mystdout.py 2>&1 | tee output.txt
# does not print to oputut.txt if mystout.py has syntax errors

打印到文件 (python3):

with open('out.txt', 'a') as f:  
    print('hello world', file=f)
    # this does not print to console, only to the file

定义一个名为“Tee”的类

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author    : Bhishan Poudel
# Date      : Jul 12, 2016


# Imports
import sys
import subprocess

##=============================================================================
class Tee(object):
    def __init__(self, *files):
        self.files = files
    def write(self, obj):
        for f in self.files:
            f.write(obj)
            f.flush() 
    def flush(self) :
        for f in self.files:
            f.flush()

f = open('out.txt', 'w')
original = sys.stdout
sys.stdout = Tee(sys.stdout, f)
##=============================================================================
print('This works good, prints all the output to both console and to a file')
print("This does not print output to file in case of syntax errors")
print("This does not print output of subprocess.call")

问题假设我有一个可执行文件(来自打印 hello 的 C 程序)

subprocess.call('./hello')
# How to print output of this executable to both console and outputfile?

注意:生成可执行hello的代码

// gcc -o hello hello.c
#include<stdio.h>

int main() {
    printf("hello\n");
return 0; }

相关链接:
How to redirect 'print' output to a file using python?
http://linux.byexamples.com/archives/349/how-to-redirect-output-to-a-file-as-well-as-display-it-out/
Output on the console and file using python

Answer 1

如果您使用的是 bash(最低版本 4)，您可以运行:./stdout |to tee output.txt。否则你的建议 ./stdout 2>&1 | tee output.txt 也应该有效。