Question: I have the following code. It works for the first directory but not the second one...
What I am trying to do is to count the lines on each of the files in different directory.

```
import csv
import copy
import os
import sys
import glob

os.chdir('Deployment/Work/test1/src')
names={}
for fn in glob.glob('*.c'):
    with open(fn) as f:
        names[fn]=sum(1 for line in f if line.strip() and not line.startswith('/') and not line.startswith('#') and not line.startswith('/*')and not line.startswith(' *'))    

print ("Lines test 1 ", names)
test1 = names

os.chdir('Deployment/Work/test2/src')
names={}
for fn in glob.glob('*.c'):
    with open(fn) as f:
        names[fn]=sum(1 for line in f if line.strip() and not line.startswith('/') and not line.startswith('#') and not line.startswith('/*')and not line.startswith(' *'))    

print ("Lines test 2 ", names)
test2 = names

print ("Lines ", test1  + test2)

```

Traceback:

```
FileNotFoundError: [WinError 3] The system cannot find the path specified: 'Deployment/Work/test2/src'

```

Answer: 
Your `os.chdir` is interpreted relative to the current working directory. Your first `os.chdir` changes the working directory. The system tries to find the second path relative to the first path.

There are several ways to solve this. You can keep track of the current directory and change back to it. Else make the second `os.chdir` relative to the first directory. (E.g. `os.chdir(../../test2/src')`. This is slightly ugly. A third option is to make all paths absolute instead of relative.
I suppose the script is not working because you are trying to change the directory using a relative path. This means that when you execute the first `os.chdir` you change your working directory from the current one to `'Deployment/Work/test1/src'` and when you call `os.chdir` the second time the function tries to change working directory to `'Deployment/Work/test1/src/Deployment/Work/test2/src'` that I suppose is not what you want.

To solve this you can either use an absolute path:

`os.chdir('/Deployment/Work/test1/src')`

or before the first `os.chdir` you could keep track of your current folder:

`current = os.getcwd()
os.chdir('Deployment/Work/test1/src')
...
os.chdir(current)
os.chdir('Deployment/Work/test2/src')`