Argparse in iPython notebook: unrecognized arguments: -f

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I am trying to pass a .py file to ipython notebook environment. I have never had to deal directly with argparse before. How do I rewrite the main() function?

I tried to delete the line of def main(): and keep the rest of the code.

But args = parser.parse_args()" returned an error: error: unrecognized arguments: -f.

And when I run . %tb: showing this

def main():
parser = argparse.ArgumentParser()
parser.add_argument('--data_dir', type=str, default='data/tinyshakespeare',
                   help='data directory containing input.txt')
parser.add_argument('--input_encoding', type=str, default=None,
                   help='character encoding of input.txt, from')
parser.add_argument('--log_dir', type=str, default='logs',
                   help='directory containing tensorboard logs')
parser.add_argument('--save_dir', type=str, default='save',
                   help='directory to store checkpointed models')
parser.add_argument('--rnn_size', type=int, default=256,
                   help='size of RNN hidden state')
parser.add_argument('--num_layers', type=int, default=2,
                   help='number of layers in the RNN')
parser.add_argument('--model', type=str, default='lstm',
                   help='rnn, gru, or lstm')
parser.add_argument('--batch_size', type=int, default=50,
                   help='minibatch size')
parser.add_argument('--seq_length', type=int, default=25,
                   help='RNN sequence length')
parser.add_argument('--num_epochs', type=int, default=50,
                   help='number of epochs')
parser.add_argument('--save_every', type=int, default=1000,
                   help='save frequency')
parser.add_argument('--grad_clip', type=float, default=5.,
                   help='clip gradients at this value')
parser.add_argument('--learning_rate', type=float, default=0.002,
                   help='learning rate')
parser.add_argument('--decay_rate', type=float, default=0.97,
                   help='decay rate for rmsprop')
parser.add_argument('--gpu_mem', type=float, default=0.666,
                   help='%% of gpu memory to be allocated to this process. Default is 66.6%%')
parser.add_argument('--init_from', type=str, default=None,
                   help="""continue training from saved model at this path. Path must contain files saved by previous training process:
                        'config.pkl'        : configuration;
                        'words_vocab.pkl'   : vocabulary definitions;
                        'checkpoint'        : paths to model file(s) (created by tf).
                                              Note: this file contains absolute paths, be careful when moving files around;
                        'model.ckpt-*'      : file(s) with model definition (created by tf)
args = parser.parse_args()

You can try args = parser.parse_args(args=[]).

How to use python ArgumentParser on databricks?, [--log LOG_FILE] [-d] infile error: unrecognized arguments: 0 50000 But you can run argument parser in databricks in two ways: Pass the arguments in an array: import argparse parser = argparse. notebook and run that notebook from you current notebook with the %run command. Command line arguments may take some practice or getting used to if you are new to working in a terminal — but I have faith in you! Don’t get discouraged. Take your time. And keep practicing. Before you know it, you’ll have mastered command line arguments — take the time now to invest in your education and this valuable skill!

If you use iPython for testing, transforming argparse into class format can be a quick dummy solution like this.

class Args:
  data = './data/penn'
  model = 'LSTM'
  emsize = 200
  nhid = 200


Github page repo offers web transformation service. I hope that it would be helpful for your testing.

Script that transforms your argparse to python class format.

python3 [] []


#!/usr/bin/env python3
from collections import OrderedDict
import sys
import re
DBG = False

#add_argument(), set_defaults() only available.
ListStartPatt = re.compile(r'\s*\[.*')
ListStartPatt2 = re.compile(r'\).*\[.*') # list out of function scope.
ListPatt = re.compile(r'(\[.*?\])')
GbgPatt = re.compile(r'(.*?)\)[^\)]+') # for float('inf') cmplx.
GbgPatt2 = re.compile(r'(.*?)\).*') # general gbg, ? for non greedy.
LpRegex = re.compile(r'\({1,}\s{0,}')
RpRegex = re.compile(r'\s{0,}\){1,}')
PrRegex = re.compile(r'\((.*)(\))(?!.*\))') # from \( to last \).
CmRegex = re.compile(r'\s{0,},\s{0,}')
StrRegex = re.compile(r'\'(.*?)\'')

# Argument dict : {arg_name : value}

# process 'default=' value.
def default_value(tval, dtype=''):
  # string pattern.
  regres = StrRegex.match(tval) 
  if regres and not'int|float|long|bool|complex', dtype):
    if DBG:
      print('default_value: str patt found')
    tval =
    return tval

  # typed pattern.
  CommaSeparated = CmRegex.split(tval)[0]
  if DBG:
    print('comma sepearated value:', CommaSeparated)

  if ListStartPatt.match(CommaSeparated) and not ListStartPatt2.match(CommaSeparated):
    lres =
    if lres:
      tval =
    if DBG:
      print('list patt exist tval: ', tval)
  else :
    tval = CmRegex.split(tval)[0]
    if DBG:
      print('no list format tval: ', tval)

  # if default value is not like - int('inf') , remove characters after ')' garbage chars.
  ires = RpRegex.split(tval)[0]
  if not ('int|float|long|bool|complex', ires) and'[a-z]+\(',ires)):
    if DBG:
      print('not int("inf") format. Rp removed tval : ', tval)
    tval = re.split(r'\s{0,}\){1,}',tval)[0]
    gbg =
    if gbg:
      tval =  
      if DBG:
        print('garbage exist & removed. tval : ', tval)

  # int('inf') patt.
    if DBG:
      print('type("inf") value garbaging!')
    gbg =
    if gbg:
      if DBG:
        print('garbage found, extract!')
      tval =

  return tval

# Handling add_argument()
def add_argument(arg_line):
  global argDct
  if DBG:
    print('\nin add_argument : **Pre regex: ', arg_line)

  argument name
  # argname = DdRegex.split(arg_line)[1] # Dash or regex for arg name.
  argname ='\'--(.*?)\'', arg_line)
  if not argname:
    argname ='\'-+(.*?)\'', arg_line)

  # dest= keyword handling.
  dest =',\s*dest\s*=(.*)', arg_line)
  if dest:
    dval =
    dval = default_value(dval)
    argname =

  # hyphen(-) to underscore(_)
  if argname:
    argname ='-', '_')
  else :
    # naive str argname.
    sres = StrRegex.match(arg_line)
    if sres:
      argname =
    if not argname:
      return # no argument name 

  check for syntaxes (type=, default=, required=, action=, help=, choices=)
  dtype = ''
  dres =',\s*type\s*=\s*(.*)', arg_line)
  if dres:
    dtype =
    dtype = CmRegex.split(dtype)[0]

  dfult =',\s*default\s*=\s*(.*)', arg_line)
  rquird =',\s*required\s*=\s*(.*)', arg_line)
  action =',\s*action\s*=\s*(.*)', arg_line)
  hlp =',\s*help\s*=\s*(.*)', arg_line)
  chice =',\s*choices\s*=\s*(.*)', arg_line)

  # help message
  hlp_msg = ''
  if hlp:
    thl =
    if DBG:
      print('handling help=')
    hlp_msg = default_value(thl)
    if hlp_msg:
      hlp_msg = 'help='+hlp_msg

  # choice message
  choice_msg = ''
  if chice:
    tch =
    if DBG:
      print('handling choices=')
    choice_msg = default_value(tch)
    if choice_msg:
      choice_msg = 'choices='+choice_msg+' '

  argument value
  # tval: argument value.
  tval = ''
  # default exist.
  if dfult:
    tval =
    tval = default_value(tval, dtype)
    if DBG:
      print('value determined : ', tval)

  # action or required syntaxes exist.
  elif action or rquird:
    if DBG:
      print('in action/required handling')
    msg_str = ''
    if action:
      tval =
      msg_str = 'action'
    elif rquird:
      tval =
      msg_str = 'required'

    tval = default_value(tval)
    tval = ' ** ' + msg_str + ' '+tval+'; '+choice_msg+ hlp_msg

  # no default, action, required.
  else : 
    argDct[argname] = ' ** default not found; '+choice_msg+ hlp_msg

  # value found.
  if tval:
    argDct[argname] = tval

# Handling set_defaults()
def set_defaults(arg_line):
  global argDct
  if DBG:
    print('\nin set_defaults arg_line: ', arg_line)

  # arguments to process.
  # arguments of set_default()
  SetPatt = re.compile(r'(.+=.+\)?)')
  sres = SetPatt.match(arg_line)
  if sres:
    tv =
    if DBG:
      print("setPatt res: ", tv)
    tv = re.sub(r'\s+','', tv)
    if DBG:
      print('\nset_default values: ', tv)

  # one arguemnt regex.
  SetArgPatt = re.compile(r',?([^=]+=)[^=,]+,?')
  # handling multiple set_default() arguments. (may have a bug)
  while True:
    tval =''
    # func closed.
    if re.match(r',*\).*',tv):
    if DBG:
      print('set_default remaining: ', tv)

    nres = SetArgPatt.match(tv)
    if nres:
      tname =
      if len(tv.split(tname, 1)) > 1:
        tval = tv.split(tname,1)[1]
        tval = default_value(tval)
        tname = tname.rsplit('=',1)[0]

      if DBG:
        print('set_default tnam: ', tname)
        print('set_default tval: ', tval)
      if tname:
        argDct[tname] = tval

      # split with processed argument.
      tv = tv.split(tnv)
      if len(tv) > 1:
        tv = tv[1]
      # no more value to process

    # no arg=value pattern found.

# Remove empty line & Concatenate line-separated syntax.
def preprocess(fname):
  try :
    with open(fname, 'r', encoding='UTF8') as f:
      txt =
      t = txt.splitlines(True)
      t = list( filter(None, t) )

      # remove empty line
      t = [x for x in t if not re.match(r'\s{0,}\n',x)]
      # concatenate multiple lined arguments.
      # empl : lines to be deleted from t[].
      empl = []
      for i in range(len(t)-1, 0, -1):
        if not'add_argument|set_defaults', t[i]):
          t[i-1] += t[i]
          t[i-1]=re.sub(r'\s{1,}',' ',t[i-1])

      for d in empl:
      for i, line in enumerate(t):
        t[i] = line.replace('\"', '\'').split('parse_args()')[0]
      return t

  except IOError:
    print('IOError : no such file.', fname)

def transform(fname):
  # t : list() contains add_argument|set_defaults lines.
  arg_line_list = preprocess(fname)

  for i, arg_line in enumerate(arg_line_list):
    t =

    if t:
      t = # t: content of add_argument Parentheses.
    else :
      continue # nothing to parse.

    if'add_argument\s*\(', arg_line):
    else :
      # Nothing to parse.

  print('\nclass Args:')
  for i in argDct:
    print(' ',i, '=', argDct[i])

def main():
  if len(sys.argv) <2:
    print('Usage : python [] [] ...')

  #handling multiple file input.
  for fname in sys.argv:

if(__name__ == "__main__"):

argparse: A quick overview of command line interfaces in Python , an interpreter like iPython or a Jupyter Notebook as well. Submitting a single argument “abc” results in: parser.parse_args('abc'.split()) usage: PROG [-h] [-b BAZ] foo bar PROG: error: too few arguments. Actually argparse does still "ignore" _unrecognized_args. As long as these "unrecognized" arguments don't use the default prefix you will hear no complaints from the parser. Using @anutbu's configuration but with the standard parse.parse_args(), if we were to execute our program with the following arguments. $ program --foo BAR a b +cd e

As @nbro suggested, the following command should work:

args = parser.parse_args(args=[])

In addition, if you have required arguments in your parser, set them inside the list:

args = parser.parse_args(args=['--req_1', '10', '--req_2', '10'])

Where you previously used:

import argparse
parser = argparse.ArgumentParser(description="Dummy parser")
parser.add_argument("--req_1", type=int, required=True, help="required int 1")
parser.add_argument("--req_2", type=int, required=True, help="required int 2")

You can also see from the notebook all params:

print("see all args:", args)
print("use one arg:", args.req_1)

You can find more information in the docs: Parsing arguments

Argument parsing after %run -m module · Issue #8437 · ipython , To reproduce: # import sys print(sys.argv) Then: $ ipython [​TerminalIPythonApp] CRITICAL | Unrecognized flag: '--option' $ ipython -m run_test (the command line interface was implemented using argparse). Currently i have installed Ipython using Anaconda and writing a code to plot chart using jupyter notebook UI. I want to pass few arguments to my working script with the help of argparse module. below is the code..

problem with argparse in Python 3 : Python, problem with argparse in Python 3. I am using argparse module to process command line arguments. error: unrecognized arguments: --wold. The variable is some form of ‘magic’ that argparse performs for free (i.e. no need to specify which variable that value is stored in). You will also notice that its name matches the string argument given to the method, echo. Note however that, although the help display looks nice and all, it currently is not as helpful as it can be.

argparse: use of double dash to separate options and positional , Hello, I'm trying to use argparse in a program that gets some options and positional arguments. -v -x hello world Fails with an error message 'error: unrecognized arguments: -x'. Thanks, Amit -- --​listinfo/python-list for interactive, D3.js graphs in IPython Notebooks. The following code snippet fails when it is executed with F9 or in cell mode. import argparse parser = argparse.ArgumentParser() args = parser.parse_args() The reason is the arguments passed to the ipython console, in particular the -f:

Section 4.1: Script Environment & Command-Line Arguments, Azure Notebooks HTML Preview ArgumentParser, argparse.parse_args; argparse.add_argument: action, nargs, default, type, choices, metavar, help Determine whether Python code is running as a script or being imported as a module However, if we pass an unrecognized argument to the script, the argparse module  Arguments that are read from a file (see the fromfile_prefix_chars keyword argument to the ArgumentParser constructor) are read one argument per line. convert_arg_line_to_args() can be overridden for fancier reading. This method takes a single argument arg_line which is a string read from the argument file. It returns a list of arguments parsed