How print every line of a python script as its being executed (including the console)?

问题

I'd like to print every line of python script as it's being executed, as well as the log from the console as every line is being executed.

For example, for this script:

import time
print 'hello'
time.sleep(3)
print 'goodbye'

I'd like it to generate the following in the console:

line 1: import time
line 2: print 'hello'
hello
line 3: time.sleep(3)
line 4: print 'goodbye'
goodbye

See below for my attempt

import subprocess as subp

python_string = """
import sys
import inspect

class SetTrace(object):
    def __init__(self, func):
        self.func = func

    def __enter__(self):
        sys.settrace(self.func)
        return self

    def __exit__(self, ext_type, exc_value, traceback):
        sys.settrace(None)

def monitor(frame, event, arg):
    if event == "line":
        file_dict = dict(enumerate("{}".split("|")))
        line_number = frame.f_lineno-25
        if line_number > 0:
           print "line " + str(line_number)+ ": " + file_dict[line_number]
    return monitor

def run():
    {}

with SetTrace(monitor):
    run()

"""
python_string_example = """
    import time
    print 'hello'
    time.sleep(3)
    print 'goodbye'
"""
python_string = python_string.format("|".join([i.strip() for i in python_string_example.split("\n")]),python_string_example)


proc = subp.Popen(['python', '-'], stdin=subp.PIPE,stdout=subp.PIPE, stderr=subp.STDOUT)
proc.stdin.write(python_string)
proc.stdin.close()
for line in proc.stdout:
    print '{}'.format(line.strip())
proc.wait()

Although, this produces the desired result, it produces the output after the entire script is executed. It also is a very bad hack since it will most likely break depending on what python_string_base is

回答1:

You can use the trace module for this

If your 4 lines of code are in tmp.py, calling it as

python -m trace -t tmp.py

Produces the following output

 --- modulename: tmp, funcname: <module>
tmp.py(1): import time
tmp.py(2): print 'hello'
hello
tmp.py(3): time.sleep(3)
tmp.py(4): print 'goodbye'
goodbye
 --- modulename: trace, funcname: _unsettrace
trace.py(80):         sys.settrace(None)

来源：https://stackoverflow.com/questions/43686761/how-print-every-line-of-a-python-script-as-its-being-executed-including-the-con

标签

python

subprocess

exec

frame

inspect