例如（更改a每次运行的值）：
a = 0
b = 1
print a + b
with open(__file__, 'r') as f:
lines = f.read().split('\n')
val = int(lines[0].split(' = ')[-1])
new_line = 'a = {}'.format(val+1)
new_file = '\n'.join([new_line] + lines[1:])
with open(__file__, 'w') as f:
f.write('\n'.join([new_line] + lines[1:]))
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