ekns

IPython has to my knowledge always used those kind of labels for inputs and outputs. It just follows from the CLI convention.

I looked up how it was in version 0.0.1 from 12 years ago and it turns out the original CLI format was made to look like Mathematica [1]: "Interactive execution with automatic history, tries to mimic Mathematica's prompt system".

[1] https://gist.github.com/fperez/1579699

I was curious about what the most common dependencies were so I hacked the IPython notebook a bit:

  import json, pip, re
  from base64 import b64decode
  from itertools import chain
  from collections import Counter

  def get_name(x):
      "This captures most of the base names for dependencies"
      if x.startswith('#'):
          return
      try:
          return pip.req.InstallRequirement.from_line(re.sub('["\']', '', x)).name.lower()
      except ValueError:
          return
  
  C = Counter()
  
  data = []
  with open('pypi-deps.csv', 'r') as file:
      for line in file:
          name, version, deps = line.split('\t')
          deps = filter(None, map(get_name, json.loads(b64decode(deps))))
          data+= [(name, version, deps)]
          for x in deps: C[x] += 1
  
  print '\n'.join('{0}\t{1}'.format(*x) for x in C.most_common(20))

The results:

  setuptools	1949
  django	546
  zope.interface	244
  requests	241
  lxml	204
  zope.component	203
  simplejson	202
  flask	158
  zc.buildout	127
  argparse	110
  zope.schema	109
  python-dateutil	108
  jinja2	105
  distribute	104
  pyyaml	103
  fanstatic	95
  beautifulsoup	93
  zope.publisher	91
  sqlalchemy	91
  numpy	89

I've been using PasswordMaker (http://www.passwordmaker.org/) for years to generate most of my site-specific passwords when needed. PasswordMaker uses a master password together with a site's domain name to hash a site-specific password. It has Chrome and Firefox extensions for filling in the password fields with one button.

Unfortunately, by default it uses MD5 and 8-character passwords. I always set this to SHA256 and at least 12 characters when first installing the extension on some device/browser.

Most sites play well with this, but there are exceptions: having to change a password is a bit ugly when the passwords are generated from a given master password and the site's domain name. A more common problem is when a site refuses to accept certain characters in the hashed password or when a site requires some number of digits and uppercase letters, for instance. I currently just store these exceptions with Keepass.

I see 1Password being mentioned a lot but I started using PasswordMaker and Keepass well before I'd first heard of 1Password so I don't know how it might compare.

I don't know the details, but it is possible for a USB keyboard to support N-key rollovers. As an example: http://www.corsair.com/en/support/faq/vengeance-gaming/

I've had this happen with facebook chat once maybe two years ago. I wonder if there have been other places where something like this has happened...

You could do this with grep or ack or ag:

  grep bar -A 5 -B 5 files... | grep foo

-A n prints n lines following the match (bar) and -B n prints n lines before the match.

Here's a more portable version (works with bash, pdftk and wget):

wget http://i.stanford.edu/~ullman/focs/ch{01..14}.pdf && pdftk ch*.pdf cat output merged.pdf