我想在使用字符串的exec函数时使用python从控制台获取文本,以及执行它的脚本中的行
下面的python脚本是一个字符串,我使用exec对其进行计算
python_string = """
result_one = len([1,2,3])
print result_one
result_two = range(r)
print result_two
result_three = max(result_two)
print "done"
"""
exec(python_string)
这将在控制台中返回以下内容:
3
[0, 1, 2]
done
我想在控制台执行时获取其中的文本。换句话说,我希望返回以下三个字符串,因为它们出现在控制台中
'3'
'[0, 1, 2]'
'done'
另外,我希望只在python\u字符串执行时获取它的每一行,所以在执行之后,我应该看到下面的每一行
result_one = len([1,2,3])
print result_one
result_two = range(r)
print result_two
result_three = max(result_two)
print "done"
我相信要实现这一点,我需要在调用堆栈中获得相关的框架,我在这里读到了:What is the difference between a stack and a frame?
我尝试使用以下代码来完成此任务,但收效甚微:
import sys
import inspect
python_string_as_dictionary = dict(enumerate(open(inspect.getfile(inspect.currentframe()), 'r+').read().split("\n")))
#>>{0: 'import sys', 1: 'import inspect', 2: '', 3: 'f_dict = dict(enumerate(open(inspect.getfile(inspect.currentframe()), \'r+\').read().split("\\n")))', 4: 'print f_dict', 5: 'class SetTrace(object):', 6: ' def __init__(self, func):', 7: ' self.func = func', 8: '', 9: ' def __enter__(self):', 10: ' sys.settrace(self.func)', 11: ' return self', 12: '', 13: ' def __exit__(self, ext_type, exc_value, traceback):', 14: ' sys.settrace(None)', 15: '', 16: '', 17: 'def monitor(frame, event, arg):', 18: '\tprint event', 19: '\tprint "line: {}".format(str(frame.f_lineno))', 20: '\tif event == "line" :', 21: '\t\treturn monitor', 22: '', 23: 'python_string = """', 24: 'result_one = len([1,2,3])', 25: 'print result_one', 26: 'result_two = range(result_one)', 27: 'print result_two', 28: 'result_three = max(result_two)', 29: 'print "done"', 30: '"""', 31: 'with SetTrace(monitor):', 32: ' exec(python_string)', 33: '', 34: '', 35: ''}
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):
print "line: {}".format(str(frame.f_lineno))
print python_string_as_dictionary[frame.f_lineno-1].strip()
if event == "line" :
return monitor
python_string = """
result_one = len([1,2,3])
print result_one
result_two = range(result_one)
print result_two
result_three = max(result_two)
print "done"
"""
with SetTrace(monitor):
exec(python_string)
可以在要运行的程序中作为子进程和管道运行另一个python副本。
-
参数告诉python从stdin
读取程序,并在看到EOF
时运行它。你知道吗相关问题 更多 >
编程相关推荐