One of the biggest nuisances for programmers, just beneath date/time
APIs in the pantheon of annoyances, is that we are constantly dealing
with escaping/encoding/formatting issues.
I wrote this little program as a cheat sheet for myself and others.
Hope it helps.
# escaping quotes
legal_string = ['"', "'", "'\"", '"\'', """ '" """]
for s in legal_string:
print("[" + s + "]")
# formatting
print 'Hello %s' % 'world'
print "Hello %s" % 'world'
planet = 'world'
print "Hello {planet}".format(**locals())
print "Hello {planet}".format(planet=planet)
print "Hello {0}".format(planet)
# Unicode
s = u"\u0394"
print s # prints a triangle
print repr(s) == "u'\u0394'" # True
print s.encode("utf-8") == "\xce\x94" # True
# other examples/resources???
# Web encodings
import urllib
s = "~foo ~bar"
print urllib.quote_plus(s) == '%7Efoo+%7Ebar' # True
print urllib.unquote_plus(urllib.quote_plus(s)) == s # True
import cgi
s = "x < 4 & x > 5"
print cgi.escape(s) == 'x < 4 & x > 5' # True
# JSON
import json
h = {'foo': 'bar'}
print json.dumps(h) == '{"foo": "bar"}' # True
try:
bad_json = "{'foo': 'bar'}"
json.loads(bad_json)
except:
print 'Must use double quotes in your JSON'
It's tested under Python3.2. I didn't dare to cover regexes. It
would be great if somebody could flesh out the Unicode examples or
remind me (and others) of other common APIs that are useful to have in
your bag of tricks.
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