Pass variable to subprocess

[paulo79]

Hi all,

I want to pass a variable to this command :

1 2	VARIABLE=12 v_num_final_distinct_grid_disks_per_cell_and_dg = subprocess.check_output("cat /tmp/logall | sort -u | grep -v VARIABLE", shell=True);

How can I do that?
I tried:

1 2	VARIABLE=12 v_num_final_distinct_grid_disks_per_cell_and_dg = subprocess.check_output("cat /tmp/logall | sort -u | grep -v %s",VARIABLE, shell=True);

But didnt work.

[snippsat]

String formatting and now use f-string new in Python 3.6 ➡

1 2 3 4

>>> VARIABLE = 12 >>> s = f"cat /tmp/logall | sort -u | grep -v {VARIABLE}" >>> s 'cat /tmp/logall | sort -u | grep -v 12'

[paulo79]

String formatting and now use f-string new in Python 3.6 ➡

1 2 3 4

>>> VARIABLE = 12 >>> s = f"cat /tmp/logall | sort -u | grep -v {VARIABLE}" >>> s 'cat /tmp/logall | sort -u | grep -v 12'

Is there a way to in python 2.7? I cannot use 3 yet.

[paulo79]

String formatting and now use f-string new in Python 3.6 ➡

1 2 3 4

>>> VARIABLE = 12 >>> s = f"cat /tmp/logall | sort -u | grep -v {VARIABLE}" >>> s 'cat /tmp/logall | sort -u | grep -v 12'

Is there a way to in python 2.7? I cannot use 3 yet.

I found it:

1 2 3 4 5 6 7 8 9 10 11 12

>>> VARIABLE=12 >>> v_num_final_distinct_grid_disks_per_cell_and_dg = subprocess.check_output("cat /tmp/logall | sort -u | grep -v {}".format(VARIABLE), shell=True); >>> >>> print(v_num_final_distinct_grid_disks_per_cell_and_dg) 10   >>> VARIABLE=10 >>> v_num_final_distinct_grid_disks_per_cell_and_dg = subprocess.check_output("cat /tmp/logall | sort -u | grep -v {}".format(VARIABLE), shell=True); >>> print(v_num_final_distinct_grid_disks_per_cell_and_dg) 12   >>>

[DeaD_EyE]

4 alternatives:

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import subprocess   # VARIABLE=12 # v_num_final_distinct_grid_disks_per_cell_and_dg = subprocess.check_output("cat /tmp/logall | sort -u | grep -v VARIABLE", shell=True) # grep -v is invert match     def insecure(variable: str) -> str:     return subprocess.check_output(f"cat /tmp/logall | sort -u | grep -v {variable}", shell=True, encoding="utf8")         def silly(variable: str) -> str:     """     Using PIPE to connect stdout with stdin of next process     """     cat_proc = subprocess.Popen(["cat", "/tmp/logall"], encoding="utf8", stdout=subprocess.PIPE)     sort_proc = subprocess.Popen(["sort", "-u"], encoding="utf8", stdin=cat_proc.stdout, stdout=subprocess.PIPE)     grep_proc = subprocess.Popen(["grep", "-v", variable], encoding="utf8", stdin=sort_proc.stdout, stdout=subprocess.PIPE)     grep_proc.wait()     return grep_proc.stdout.read()     def better(variable: str) -> str:     lines = []     with open("/tmp/logall") as fd:         # fd is the the file-object         # iterating over fd -> lines         # creating a set from fd -> unique lines         # sort set -> sorted unique lines         for line in sorted(set(fd)):             if variable not in line:                 lines.append(line.rstrip())     return "\n".join(lines)     def better2(variable: str) -> list[str]:     with open("/tmp/logall") as fd:         return [             line.rstrip()             for line in sorted(set(fd))             if variable not in line         ]

better2 uses a list-comprehension to return all not matching lines as a list. The other functions do return the whole text as a single str.