print specific string result execution on python

Question

i i only want to save specific print result of every execution of code on text file

i try with

if to,from_addr != '0x':
            print(To:,From:)
            os.system(f'echo {To:} {From:} >> output.txt')

but everytime fail, also I also want that every time a new result appears, a new line is added and not replace the later output

enter image description here

i try with

with open("Output.txt", "w") as text_file:
    print(f"To:" "From:" {to} {from_addr}", file=text_file)

from is a reserved word so I would not use that a variable name. I have a hard time understanding what you are asking. Maybe give us sample input (as text), and expected output? Also, I can't tell if the above is incomplete snippets or if you haven't extract data from input into variables yet. — user9706
– user9706, Commented Jan 23, 2023 at 7:43
@AllanWind exactly, also print is not the function to write to a file, you need to used the file pointer text_file you defined when using context manager. — Gameplay
– Gameplay, Commented Jan 23, 2023 at 7:46
@Gameplay. print can write to a file if you specify file=<handler> as parameter. By default, print use the stdout handler. => file: a file-like object (stream); defaults to the current sys.stdout. (documentation) — Corralien
– Corralien, Commented Jan 23, 2023 at 7:53

Corralien · Accepted Answer · 2023-01-23 07:52:01Z

1

Use append mode and fix f-strings:

to = 'destination'
from_addr = 'source'

# Use append mode
with open("Output.txt", "a") as text_file:
    if not (to.startswith('0x') or from_addr.startswith('0x')):
        print(f"To: {to}\nFrom: {from_addr}", file=text_file)

edited Jan 23, 2023 at 7:52

answered Jan 23, 2023 at 7:46

Corralien

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2 Comments

cards Over a year ago

Does it do both, printing and saving?

Corralien Over a year ago

@cards. It prints the output to file handler (saving)

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