我想在退出时更改变量的值,以便在下次运行时,它仍然是最后设置的值。这是我当前代码的简短版本:
def example():
x = 1
while True:
x = x + 1
print x
在'KeyboardInterrupt'上,我希望while循环中设置的最后一个值是一个全局变量。在下次运行代码时,该值应为第2行中的“x”。是否可能?
答案 0 :(得分:0)
您可以将要保留的任何变量保存到文本文件中,然后在下次运行时将其读回脚本。
这是一个用于读取和写入文本文件的链接。 http://docs.python.org/2/tutorial/inputoutput.html#reading-and-writing-files
希望它有所帮助!
答案 1 :(得分:0)
这有点hacky,但希望它能让您了解在当前情况下可以更好地实现(pickle
/ cPickle
是您应该使用的内容,如果您想要保留更强大的数据结构 - 这只是一个简单的例子):
import sys
def example():
x = 1
# Wrap in a try/except loop to catch the interrupt
try:
while True:
x = x + 1
print x
except KeyboardInterrupt:
# On interrupt, write to a simple file and exit
with open('myvar', 'w') as f:
f.write(str(x))
sys.exit(0)
# Not sure of your implementation (probably not this :) ), but
# prompt to run the function
resp = raw_input('Run example (y/n)? ')
if resp.lower() == 'y':
example()
else:
# If the function isn't to be run, read the variable
# Note that this will fail if you haven't already written
# it, so you will have to make adjustments if necessary
with open('myvar', 'r') as f:
myvar = f.read()
print int(myvar)