Python/scripts - Revision history

Christoph: /* Miscellaneous */

2015-12-23T22:24:11Z

‎Miscellaneous

Christoph at 22:23, 23 December 2015

2015-12-23T22:23:32Z

Christoph at 22:43, 15 June 2012

2012-06-15T22:43:46Z

Christoph: /* Selective printing */

2012-06-14T20:04:19Z

‎Selective printing

Christoph at 19:42, 14 June 2012

2012-06-14T19:42:57Z

Christoph at 10:17, 13 April 2012

2012-04-13T10:17:39Z

Christoph: New page: This article will list a bunch of quick-and-dirty Python tips-and-tricks, examples, code, etc. ==Lambda functions== In stead of creating a new function of f(x): return x + 1 You coul...

2009-03-10T23:13:07Z

New page: This article will list a bunch of quick-and-dirty Python tips-and-tricks, examples, code, etc. ==Lambda functions== In stead of creating a new function of f(x): return x + 1 You coul...

New page

This article will list a bunch of quick-and-dirty [[Python]] tips-and-tricks, examples, code, etc.

==Lambda functions==
In stead of creating a new function of
f(x): return x + 1
You could use a lambda function inline, like so:
function_var = lambda x: x + 1
>>> print function_var(2)
3

[[Category:Scripting languages]]

@@ Line 84: / Line 84: @@
 ==Miscellaneous==
 * Get the current world population estimate (from census.gov):
-  $ curl -s http://www.census.gov/popclock/data/population/world | python -c 'import json,sys;obj=json.load(sys.stdin);print obj["world"]["population"]'
+  $ curl -s <nowiki>http://www.census.gov/popclock/data/population/world</nowiki> | python -c 'import json,sys;obj=json.load(sys.stdin);print obj["world"]["population"]'
 * Generate a password hash (change 'password' and 'SALT' values):

@@ Line 81: / Line 81: @@
   files = filter(os.path.isfile, os.listdir('.'))
   dirs = filter(os.path.isdir, os.listdir('.'))
 [[Category:Scripting languages]]

@@ Line 76: / Line 76: @@
 >>> re.findall('..', list)
 </pre>
 [[Category:Scripting languages]]

@@ Line 15: / Line 15: @@
 ==Selective printing==
 *Print every 4th character of the English alphabet starting with the letter/character 'c':
   alpha_lc = map(chr, range(97, 123))
   alpha_lc = [chr(i) for i in xrange(ord('a'), ord('z')+1)]

← Older revision		Revision as of 19:42, 14 June 2012
Line 12:		Line 12:
	>>> print function_var(2)		>>> print function_var(2)
	3		3
		+
		+	==Selective printing==
		+	*Print every 4th character of the English alphabet starting with the letter/character 'c':
		+	alpha_lc = map(chr, range(97, 123))
		+	alpha_lc = [chr(i) for i in xrange(ord('a'), ord('z')+1)]
		+	alpha_uc = map(chr, range(65, 91))
		+	alpha_ns = 'abcdefghijklmnopqrstuvwxyz'
		+	alpha_sp = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
		+	'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
		+	'u', 'v', 'w', 'x', 'y', 'z']
		+
		+	>>> alpha_ns[2::4] # Method 1
		+	'cgkosw'
		+
		+	>>> [alpha_lc[i] for i in range(2, len(alpha_lc), 4)] # Method 2
		+	['c', 'g', 'k', 'o', 's', 'w']
		+
		+	>>> map(chr, range(97, 123))[2::4] # Method 3 (one-liner)
		+	['c', 'g', 'k', 'o', 's', 'w']
		+
		+	==Iterative printing==
		+	*Input:
		+	data = [1,2,3,4,5,6]
		+	*Methods:
		+	for i,k in zip(data[0::2], data[1::2]):
		+	print str(i), '+', str(k), '=', str(i+k)
		+	# ~OR~
		+	for i in range(0, len(l), 2):
		+	print str(l[i]), '+', str(l[i + 1]), '=', str(l[i] + l[i + 1])
		+	*Output:
		+	1 + 2 = 3
		+	3 + 4 = 7
		+	5 + 6 = 11
		+
		+	*Other
		+	<pre>
		+	l = [1,2,3,4,5,6]
		+
		+	>>> zip(l, l[1:])
		+	[(1, 2), (2, 3), (3, 4), (4, 5), (5, 6)]
		+
		+	>>> zip(l, l[1:])[::2]
		+	[(1, 2), (3, 4), (5, 6)]
		+
		+	>>> [a+b for a,b in zip(l, l[1:])[::2]]
		+	[3, 7, 11]
		+
		+	>>> ["%d + %d = %d" % (a, b, a+b) for a,b in zip(l, l[1:])[::2]]
		+	['1 + 2 = 3', '3 + 4 = 7', '5 + 6 = 11']
		+
		+	>>> list = '1234567890'
		+	>>> n = 2
		+	>>> [list[i:i+n] for i in range(0, len(list), n)]
		+	['12', '34', '56', '78', '90']
		+	# The following two accomplish the same thing:
		+	>>> map(''.join, zip([iter(list)]2))
		+	>>> re.findall('..', list)
		+	</pre>

	[[Category:Scripting languages]]		[[Category:Scripting languages]]

← Older revision		Revision as of 10:17, 13 April 2012
Line 1:		Line 1:
	This article will list a bunch of quick-and-dirty [[Python]] tips-and-tricks, examples, code, etc.		This article will list a bunch of quick-and-dirty [[Python]] tips-and-tricks, examples, code, etc.
		+
		+	==Generate a random set of characters==
		+	''Note: Useful for creating random user passwords after a reset.''
		+	$ python -c 'import random; print "".join([random.choice("abcdefghijklmnopqrstuvwxyz0123456789\!@#$%^&*(-_=+)") for i in range(9)])'

	==Lambda functions==		==Lambda functions==