Analysis of PyPi package names and the use of dashes underscores upper and lower case

analyze_pypi_package_names.py

try:
     import xmlrpclib
except ImportError:
     import xmlrpc.client as xmlrpclib

client = xmlrpclib.ServerProxy('https://pypi.python.org/pypi')
packages = client.list_packages()

total = len(packages)
dashes = len([x for x in packages if '-' in x])
underscores = len([x for x in packages if '_' in x])
both = len([x for x in packages if '_' in x and '-' in x])
neither = len([x for x in packages if '_' not in x and '-' not in x])
alllower = len([x for x in packages if x == x.lower()])
allupper = len([x for x in packages if x == x.upper()])
mixed = len([x for x in packages if x != x.upper() and x != x.lower()])


print("Total packages : {}".format(total))
print("Packages with dashes : {} ({:.2%})".format(dashes, float(dashes) / total))
print("Packages with underscores : {} ({:.2%})".format(underscores, float(underscores) / total))
print("Packages with both dashes and underscores : {} ({:.2%})".format(both, float(both) / total))
print("Packages with both dashes and underscores : {} ({:.2%})".format(both, float(both) / total))
print("Packages with all lowercase characters : {} ({:.2%})".format(alllower, float(alllower) / total))
print("Packages with all uppercase characters : {} ({:.2%})".format(allupper, float(allupper) / total))
print("Packages with both lower and upper case characters : {} ({:.2%})".format(mixed, float(mixed) / total))

pypi_package_name_analysis.txt

Total packages : 87680
Packages with dashes : 23370 (26.65%)
Packages with underscores : 7750 (8.84%)
Packages with both dashes and underscores : 133 (0.15%)
Packages with both dashes and underscores : 133 (0.15%)
Packages with all lowercase characters : 76036 (86.72%)
Packages with all uppercase characters : 439 (0.50%)
Packages with both lower and upper case characters : 11213 (12.79%)

Package names should have dashes not underscores.
Module names must not have dashes and can have underscores.
https://www.python.org/dev/peps/pep-0008/#package-and-module-names

By adding

print("No letters at all: ", set([x for x in packages if x == x.lower()]) & set([x for x in packages if x == x.upper()]))

you'll find the following beauties

{'1337', '42', '5', '3-1', '1', '2', '2112', '0-._.-._.-._.-._.-._.-._.-0'}

amongst which 0-._.-._.-._.-._.-._.-._.-0 is definitely my favorite :) Also the "2112" package is worth having a look! Strange enough the "2" package seems to be unavailable although it was apparently listed by pypi. Any ideas?