pythonBeauty.txt

** Looping backwards
-----------------------------------------
for i in range(len(a) - 1, -1, -1):
	print a[i]

for blah in reversed(a):
	print(blah)

-> The second one is faster

** Looping over a collection and indices
-----------------------------------------
for i in range(len(a)):
	print i, '-->', a[i]

for i, blah in enumerate(a):
	print i, '-->', blah

** Looping over two collections
-----------------------------------------
n = min(len(blahs1), len(blahs2))
for i in range(n):
	print blahs1[i], '-->', blahs2[i]

for blah1, blah2 in zip(blahs1, blahs2):
	print blah1, '-->', blah2

for blah1, blah2 in izip(blahs1, blahs2):
	print blah1, '-->', blah2


** Looping in sorted order
-----------------------------------------
for color in sorted(colors):
	print color

for color in sorted(color, reverse=True):
	print color


** Custom sort order
-----------------------------------------
def compare_length(c1, c2):
	if len(c1) < len(c2): return -1
	if len(c1) > len(c2): return 1
	return 0

print sorted(colors, cmp=compare_length)

print sorted(colors, key=len) 

** Call a function until a sentinel value
-----------------------------------------
blocks = []
while True:
	block = f.read(32)
	if block == '':
		break
	blocks.append(block)

blocks = []
for block in iter(partial(f.read(32), ''):
	blocks.append(block)


** Distinguishing multiple exit loops in python
-----------------------------------------
def find(seq, target):
	found = False
	for i, value in enumerate(seq):
		if value == target:
			found = True
			break
	if not found:
		return -1
	return 1

def find(seq, target):
	for i, value in enumerate(seq):
	if value == target:
		break
	else:
		return -1
	return 

** Loop over dictioary keys and values
-----------------------------------------
for key in dic:
	print key, '-->', dic[key]

for key, val in dic.items():
	print key, '-->', val

for key, val in dic.iteritems():
	print key, '-->', val1