问题
I would like to change hardcoded values in my code. I would like the code to replace and change hardcoded values based on the number of times it runs. Beginning with:
x=1
The next time, after I run it, in the code itself, I would like to see in the code editor:
x=2
It will automatically change the values of the code without human input, so the third time its run:
x=3
And this is all done just by the script running, no human interaction whatsoever. Is there an easy way?
回答1:
You can simply write to a well-defined auxiliary file:
# define storage file path based on script path (__file__)
import os
counter_path = os.path.join(os.path.dirname(__file__), 'my_counter')
# start of script - read or initialise counter
try:
with open(counter_path, 'r') as count_in:
counter = int(count_in.read())
except FileNotFoundError:
counter = 0
print('counter =', counter)
# end of script - write new counter
with open(counter_path, 'w') as count_out:
count_out.write(str(counter + 1))
This will store an auxiliary file next to your script, which contains the counter
verbatim.
$ python3 test.py
counter = 0
$ python3 test.py
counter = 1
$ python3 test.py
counter = 2
$ cat my_counter
3
回答2:
Use config parser to store run counter in a file
import configparser
config = configparser.ConfigParser()
config_fn = 'program.ini'
try:
config.read(config_fn)
run_counter = int(config.get('Main', 'run_counter'))
except configparser.NoSectionError:
run_counter = 0
config.add_section('Main')
config.set('Main', 'run_counter', str(run_counter))
with open(config_fn, 'w') as config_file:
config.write(config_file)
run_counter += 1
print("Run counter {}".format(run_counter))
config.set('Main', 'run_counter', str(run_counter))
with open(config_fn, 'w') as config_file:
config.write(config_file)
来源:https://stackoverflow.com/questions/53388362/change-hardcoded-values-in-python-3