Xristos Xristoou wrote:
> hello
>
>
> i have one .txt file and i want to create python script with sys.argv or
> argparse or other package to define some variables in the txt file and i
> take some result.
>
>
>
> txt file maybe like this :
>
> input number 1= %var1%
> input number 2= %var2%
> result = %vresult(var1-var2)%
>
> how can i write a python script to update dynamic variables in the txt
> file ? i dont want with replace i thing so arguments is the better.
$ cat xristos.txt
input number 1= %var1%
input number 2= %var2%
result = %vresult(var1-var2)%
$ cat xristos2.py
import argparse
import sys
parser = argparse.ArgumentParser()
parser.add_argument("infile")
parser.add_argument("vars", nargs="*")
parser.add_argument("--outfile", type=argparse.FileType("w"))
args = parser.parse_args()
ns = {}
exec("\n".join(args.vars), ns)
with open(args.infile) as f:
text = f.read()
parts = text.split("%")
for i in range(1, len(parts), 2):
parts[i] = str(eval(parts[i], ns))
print("".join(parts), file=args.outfile, end="")
$ python3 xristos2.py xristos.txt var1=42 var2=33 'def vresult(a): return
a*a' --outfile -
input number 1= 42
input number 2= 33
result = 81
Be warned that the text file is now basically a Python script and can do
everything a script can do -- including wiping your hard drive.
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