Clash Royale CLAN TAG#URR8PPP

Read text file values and assign it to each value to variable

I want to read text file and find the words that starts with 56 in below text and pass each word to a variable and pass to a python file as a parameters.

My sample text file content -

51:40:2e:c0:01:c9:53:e8
56:c9:ce:90:4d:77:c6:03
56:c9:ce:90:4d:77:c6:07
51:40:2e:c0:01:c9:54:80
56:c9:ce:90:12:b4:19:01
56:c9:ce:90:12:b4:19:03


I like to pass to python file as

mytestfile.py var1 var2 var3


var1 should have value 56:c9:ce:90:4d:77:c6:03
var2 should have value 56:c9:ce:90:4d:77:c6:07
var3 should have value 56:c9:ce:90:12:b4:19:01

so on

I wrote code something like below but not working

[#var1 = "51:40:2e:c0:01:c9:53:e8"]
[#var2 = "51:40:2e:c0:01:c9:53:ea"]

filepath = '/root/SDFlex/work/cookbooks/ilorest/files/file.txt'
with open(filepath) as fp:
line = fp.readline()
cnt = 1
while line:
print("Line : ".format(cnt, line.strip()))
line = fp.readline()
cnt += 1


execute "run create volume script" do

command "python SDFlexnimblevolcreate.py #var1 #node['ilorest']['Test0'] #var2 #node['ilorest']['Test1']
cwd "#platformdirectory"
live_stream true


end

Thanks in advance

mytestfile.py

2 Answers
2

So this code prints string of required variables:

# a.py
with open('file.txt') as f:
result = ' '.join(map(lambda x: f'<x>',
filter(lambda x: x.startswith('56'),
map(str.strip, f))))
print(result, end='')


Output:

<56:c9:ce:90:4d:77:c6:03> <56:c9:ce:90:4d:77:c6:07> <56:c9:ce:90:12:b4:19:01> <56:c9:ce:90:12:b4:19:03>


You can pass result of this program using xargs to some another python program. For example if you have simple program which prints their arguments:

xargs

# b.py
import sys

print(sys.argv)


Than just type in shell:

python3 a.py | xargs python3 b.py


Output:

['b.py', '<56:c9:ce:90:4d:77:c6:03> <56:c9:ce:90:4d:77:c6:07> <56:c9:ce:90:12:b4:19:01> <56:c9:ce:90:12:b4:19:03>']


mytestfile.py

xargs

-0

Are you trying to run your mytestfile.py once for each line that starts with '56:', like this:

mytestfile.py

python mytestfile.py 56:c9:ce:90:4d:77:c6:03
python mytestfile.py 56:c9:ce:90:4d:77:c6:07
python mytestfile.py 56:c9:ce:90:12:b4:19:01


Or do you want to run it one time only, giving it all values from the file as arguments, e.g., with your example data:

python mytestfile.py 56:c9:ce:90:4d:77:c6:03 56:c9:ce:90:4d:77:c6:07 56:c9:ce:90:12:b4:19:01


If it is the former (one run per matching line), the easiest way is:

grep '^56' textfile | xargs python mytestfile.py


otherwise, you could do this:

python mytestfile.py `grep '^56' textfile`


note the latter is dependent on having no spaces in the file - and is a bit dangerous if the file is very large (you could run into the command-line length limit).

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