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74 lines
1.6 KiB
74 lines
1.6 KiB
2 years ago
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## skip_secrets
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### Instructions
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You need to write a script, `skip_secrets.py`, that will be able to decrypt the text coming form a specific file.
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The script will receive a file name as the first argument, check if the file is readable, filter the content by skipping all the lines containing `pineapple` and save the result in a file `out.txt`
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If the file passed as argument is not readable or the number of arguments is not the one expected, the script should exit with a status code `1`.
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### Usage
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Below an example of how the script is supposed to work:
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```console
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$ cat -e file.txt
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A normal pizza $
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Another normal pizza$
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A pizza with pineapple$
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Yet another very normal and delicious pizza$
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$ python3 skip_secrets.py
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$ echo $?
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1
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$ python3 skip_secrets.py file.txt
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$ cat out.txt
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A normal pizza $
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Another normal pizza$
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A pizza with pineapple$
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Yet another very normal and delicious pizza$
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$
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```
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### Hints
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- It is possible to read arguments passed to a python script using the `sys` module. Here is an example of script (`argv.py`):
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```python
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import sys
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for argv in sys.argv:
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print(argv)
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```
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And its output:
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```console
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$ python3 argv.py 1 2 3 something else
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argv.py
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1
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2
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3
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something
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else
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$
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```
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- It is possible to interrupt the execution of a script and returning a status code different from `0` with the function `exit()`. For example, consider the following `example.py`:
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```python
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exit(1)
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```
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This would be the result:
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```console
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$ python3 example.py
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$ echo $? # check the status code
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1
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```
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### Reference
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[Python sys.argv](https://docs.python.org/3/library/sys.html#sys.argv)
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