List in python- List Functions and Methods

Compare List Function : cmp(list1,list2): As the name advise, the method cmp() compares of two lists.

Where list1 -> this is the first list to be compared and list2 -> this is the second list to be compared.

What does cmp(list1,list2) method return ?

Well the return is negative integer or zero or positive integer based on below condition:

·         If list1 < list2 : Return will be negative integer

·         If list1 = list2 : Return will be Zero

·         If list1 > list2 : Return will be positive integer

# List Compare Function examples

# 1. list1 < list2 : return -1

list1 = [1,2,3,4]

list2 = [2,3,4,5]

print cmp(list1,list2)

>>> -1

# 2. list3 = list4 : return 0

list3 = ['a','b','c']

list4 = ['a','b','c']

print cmp(list3,list4)

>>> 0

# 3. list5 > list6: return 1

list5 =[2,3,4]

list6=[1,0,2]

print cmp(list5,list6)

>>> 1

Length List Function :len(list): As the name depicts , the length method returns total length of list.

# Length Method Example:

L1 = [1,2,3,[3,5,5],(1,2,3),'abc','d','e']

print len(L1)

>>> 8

Maximum List Function: max (list): Maximum method returns the item from list with maximum value.

# Maximum item from list with max value

maxList = [1,20,3,22,80]

print max(maxList)

>>> 80

Minimum List Function: min (list): Maximum method returns the item from list with minimum value.

# Minimum item from list with max value

minList = [100,80,2070,8]

print min(minList)

>>> 8

List function : list(<sequence>) :  Convert strings, tuple in to list.

#Convert string into List

myString = 'python'

myList = list(myString) # Using list constructor function converting string in to list

print myList

>>> ['p', 'y', 't', 'h', 'o', 'n']

#converting tuple in to list

myTuple = (1,2,3,4,(1,2,3)) # Tuple within tuple-Here 1,2,3 is own tuple inside of other tuple

myTupleList = list(myTuple) # Using list constructor function converting tuple in to list. In this case myTuple is an argument to list constructor function.

print myTupleList

>>> [1, 2, 3, 4, (1, 2, 3)]