Create Anaconda environment
conda create -n envName python=2.7
Change Anaconda Python environment
*NIX: source activate p2/p3 WIN: activate p2/3/pb35
Cython re-build files
python setup.py build_ext --inplace
Get cmd parameter:
sys.argv[1+]
Get absolute path:
os.path.abspath(relativePath)
Get file parent folder:
os.path.dirname(filePath)
Get list of directory files (just file names):
os.listdir(dirPath) # note no os.path
Delete file
os.remove(file)
Delete (non-empty) folder:
shutil.rmtree(path)
Create folders for a given path:
os.makedirs('/path/non-existing/dir/here')
Copy file to dir:
import shutil
shutil.copy2('/src/dir/file.ext', '/dst/dir/newname.ext') # complete target filename given
shutil.copy2('/src/file.ext', '/dst/dir') # target filename is /dst/dir/file.ext
Conditional for/linq-like statement
[file for file in os.listdir(path) if file.startswith("prefix")]
LINQ like .first(), get first item in the list
next(i for i in list) # Note no brackets
Get current date/time
import datetime; datetime.datetime.now()
Check if x seconds has passed
time.time() # gives num secs since unix epoch
Clear terminal
import os;
os.system('clear')
Regular expression search
import re
matches = re.compile('.*?').findall(testString) # find all instances matches[0] # gets the first match
re.compile('.*?').search(testString).groups()[0] # Gets the first group's matching value
Get the error information as a string:
import traceback try: failing_code() except: tb = traceback.format_exc()
Execute a terminal command (and see output on screen)
os.system("ls")
Execute a command and inspect its output/errors:
import subprocess result = subprocess.check_output( "jnml LEMS_test.xml -neuron; exit 0", stderr=subprocess.STDOUT, shell=True) print(result) # Output and errors will be in string
Get the IP address given a domain name:
import socket
socket.gethostbyname("sub.domain.asu") # Returns IP address string
Implement “with resource() as r:” auto-cleanup interface. Add these two methods to the class definition:
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, traceback):
# Cleanup script here
Justas Birgiolas 