<list_name>=[[value1,...],[value1,...],valueN]
OR
<list_name 1>=[value1,value2,valueN]
<list_name 2>=[value1,value2,valueN]
<list_name 1>=[list_name 1,list_name 2]
a=[1,3,5] b=[2,7,6,9] c=[a,b] print(c) c=[[1,3,5],[2,7,6,9]] print(c)
[[1, 3, 5], [2, 7, 6, 9]] [[1, 3, 5], [2, 7, 6, 9]]
nlst=[[1, 3, 5], [2, 7, 6, 9]]
s=0
for lst in nlst:
for n in lst:
s=s+n
print("Sum is ",s)
nlst=[[1, 3, 5], [2, 7, 6, 9]]
for lst in nlst:
s=0
for n in lst:
s=s+n
print("Sum is ",s)
Sum is 9 Sum is 24
slst=[["jan-2017","Amit",45000],
["jan-2017","Gopal",15000],
["feb-2017","Amit",25000]]
s=0
for lst in slst:
s=s+ lst[2]
print("Total sales is ",s)
Total sales is 85000
lst=['ram','ganpat','shyam','gopal','raj','mona'] lst.sort() print(lst) lst.sort(reverse=True) print(lst) lst.sort(key=len) print(lst)
['ganpat', 'gopal', 'mona', 'raj', 'ram', 'shyam'] ['shyam', 'ram', 'raj', 'mona', 'gopal', 'ganpat'] ['ram', 'raj', 'mona', 'shyam', 'gopal', 'ganpat']
lst=['ram','ganpat','shyam','gopal','raj','mona']
lst.sort()
print(lst)
def cmp(val):
return val[1:]
lst.sort(key=cmp)
print(lst)
['ganpat', 'gopal', 'mona', 'raj', 'ram', 'shyam'] ['raj', 'ram', 'ganpat', 'shyam', 'mona', 'gopal']
lst=["Gopal Jain","Amit R. Pandey","Mohan Mantri","Raj M.
Joshi","Madan Agrawal"]
lst.sort()
print(lst)
def cmp(val):
arr=val.split()
return arr[-1]
lst.sort(key=cmp)
print(lst)
['Amit R. Pandey', 'Gopal Jain', 'Madan Agrawal', 'Mohan Mantri', 'Raj M. Joshi'] ['Madan Agrawal', 'Gopal Jain', 'Raj M. Joshi', 'Mohan Mantri', 'Amit R. Pandey']
lst=[1201,61,234,10002,55]
lst.sort()
print(lst)
def cmp(val):
s=0
while val>0 :
d=val%10
s=s+d
val=val//10
return s
lst.sort(key=cmp)
print(lst)
[55, 61, 234, 1201, 10002] [10002, 1201, 61, 234, 55]
lst=["seeta pandey","amit joshi","gopal pandey","raj
joshi","chetan joshi"]
def cmp(val):
arr=val.split()
return arr[1]+arr[0]
lst.sort(key=cmp)
print(lst)
['amit joshi', 'chetan joshi', 'raj joshi', 'gopal pandey', 'seeta pandey']
lst=["seeta","amit","gopal","RAJ","chetan"]
lst.sort()
print(lst)
def cmp(val):
return val.upper()
lst.sort(key=cmp)
print(lst)
['RAJ', 'amit', 'chetan', 'gopal', 'seeta'] ['amit', 'chetan', 'gopal', 'RAJ', 'seeta']
class Person:
def __init__(self,nm,ct):
self.name=nm
self.city=ct
def showdata(self):
print(self.name,self.city)
def cmp(p):
return p.city
a=Person("Amit","Mumbai")
b=Person("Gopal","Amravati")
c=Person("Raj","Akola")
d=Person("Mona","Nagpur")
e=Person("Raja","Chandrapur")
lst=[a,b,c,d,e]
lst.sort(key=cmp)
for obj in lst:
obj.showdata()
Raj Akola Gopal Amravati Raja Chandrapur Amit Mumbai Mona Nagpur