In the code below, only the one in the test.txt from the array using grep is
I'd like to print out , but I don't know if the grep output is stored well in the variable, but I get an error no matter how many times I try.I don't know how to solve it, so please let me know.
#coding:UTF-8
import subprocess
animal=["dog", "cat", "horse", "pig", "bird" ]
WORD = [ ]
cmd = "grep-c{}test.txt"
for i in range (len(animal)) :
c=subprocess.check_output(cmd.format(animal[i]).split())
if int(c)>0:
WORD.append (animal[i])
for i in range (len(WORD)):
print("WORD[i]=%s"%WORD[i])
The following error occurred:
Traceback (most recent call last):
File "test.py", line 8, in <module>
c=subprocess.check_output(cmd.format(animal[i]).split())
File "C:\Users\aveni\AppData\Local\Programs\Python\Python38-32\lib\subprocess.py", line411, check_output
return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
File "C:\Users\aveni\AppData\Local\Programs\Python\Python38-32\lib\subprocess.py", line 512, in run
raiseCalledProcessError(retcode,process.args,
subprocess.CalledProcessError: Command '['grep', '-c', 'pig', 'test.txt'] 'return non-zero exit status 1.
If the grep command only determines if there is a string, I think it is better to use the exit code (c.returncode).subprocess.check_output issues a CalledProcessError when the exit status of the command you executed is non-zero, and grep has an exit code of 0 only when the string you are looking for matches. check_output was #-*-coding:utf-8-*-
import subprocess
animal=["dog", "cat", "horse", "pig", "bird" ]
WORD = [ ]
cmd = "grep-c{}test.txt"
for ani in animal:
c=subprocess.run(cmd.format(ani).split(), capture_output=True)
if int(c.stdout)>0:
WORD.append(ani)
For win WORD:
print("WORD[i]=%s"%w)
If you use subprocess.check_output(), you will be capturing subprocess.CalledProcessError.
Also, this has nothing to do with the main topic, but if the search word contains blank characters (TAB, spaces, etc.), the code in the question field will generate an error.The following lists the search terms in a single quote and specifies shell=True in subprocess.check_output().
import subprocess
animal=['dog', 'cat', 'horse', 'pig', 'bird', 'wild boar']
WORD = [ ]
cmd = r "grep-c'{}'test.txt"
for name in animal:
try:
c=subprocess.check_output (cmd.format(name), shell=True)
except subprocess.CalledProcessError as ex:
if ex.returncode==1:##None match
c=0##c=ex.output
elifex.returncode==2:##Error occurred
print(ex)
break
if int(c)>0:
WORD.append(name)
for i in range (len(WORD)):
print(f'WORD[{i}] = {WORD[i]}')
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