def bubble_sort(a):
for i in range(0, len(a)):
for j in range(0, len(a) - 1):
if(a[i] < a[j]):
a[i], a[j] = a[j], a[i] #can someone explain this part of the code for me
#i tried doing (im more of a c++ programmer):
temp = 0
temp = a[i]
a[i] = a[j]
a[j] = temp
#but that didn't work well

I am also not pyhton guy but I think at line 5 the values of a[i] and a[j] are being swap if a[i] is less then a[j] and process goes on until array is sorted.
Its was really weird experience for me to look at python code for first time. I hope my explaination helps you :) Else other python experts are there for your answers. Good Luck :)

You have the range endings reversed and you want to start at +1 on the inner loop.

for x in range(0, len(a)-1):
for j in range(x+1, len(a)):

Also you swap every time there is a difference instead of once per loop.

import random
a=[random.randint(1, 100) for ctr in range(20)]
print a
#
for x in range(0, len(a)-1):
largest = x
for y in range(x+1, len(a)):
if a[largest] < a[y]:
largest = y
if largest > x:
temp = a[largest]
a[largest] = a[x]
a[x] = temp
print a

@wooeee: you are doing selection sort not bubble sort. On the other hand bubble sort is so inefficient, that you should use insertion or selection sort.
______

For bubble sort it is customary to set flag for if swaps were made and stop sort when no swaps were done in inside loop.

in Python you can swap variables via tuple packing

a = 1
b = 2
# swap a with b
a, b = b, a # now b = 1 and a = 2
# test
print(a)
print(b)
# for clarity you may optionally surround the tuples with ()
# (a, b) = (b, a)

Maybe mine is more Pythonic (non-destructive sorted style)

import random
import time
def bubble(seq):
seq = seq[:]
for thisfar in reversed(range(len(seq))):
done = True
for pos in range(thisfar):
if seq[pos] > seq[pos+1]:
seq[pos], seq[pos+1] = seq[pos+1], seq[pos]
done = False
if done:
#print thisfar
return seq
def select(seq):
seq = seq[:]
for thisfar in range(len(seq)):
for pos in range(thisfar, len(seq)):
if seq[pos] < seq[thisfar]:
seq[pos], seq[thisfar] = seq[thisfar], seq[pos]
return seq
mixed = list(random.random() for c in range(4000))
t0 = time.clock()
s=bubble(mixed)
#print s
t1 = time.clock()
s2=select(mixed)
#print s
t2 = time.clock()
assert sorted(mixed)==s==s2 and s != mixed
t3 = time.clock()
print('Bubble %.3f vs selection %.3f, sorted %.3f' % (t1-t0, t2-t1, t3-t2))

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