List comprehension in python

Simple list comprehension using for loop

Program

mylist = [100,200,300,400,500]
newlist = []
for item in mylist:
    newlist.append(item)
    
print(newlist)

# create a new list using comprehension
mylist = [100,200,300,400,500]
newlist = [item for item in mylist]
print(newlist)

See Output

List comprehension using for loop and if condition

Program

mylist = [100,200,300,400,500]
newlist = []
for item in mylist:
    if item > 200:
        newlist.append(item)
        
    
print(newlist)

# create a new list using comprehension
mylist = [100,200,300,400,500]
newlist = [item for item in mylist if item > 200]
print(newlist)

See Output

List comprehension using for loop and if-else condition

Program

mylist = [100,200,300,400,500]
newlist = []
for item in mylist:
    if item > 200:
        newlist.append(item)
    else:
        newlist.append(1000)
    
print(newlist)

# create a new list using comprehension
mylist = [100,200,300,400,500]
newlist = [item if item > 200 else 1000 for item in mylist]
print(newlist)

See Output

Convert two dimensional list into one dimensional list using list comprehension

Program

# create a new list using loop
mylist = [[10,20,30,40,50],[100,200,300,400,500],[1000,2000,3000,4000,5000]]
newlist = []
for innerlist in mylist:
    for item in innerlist:
        newlist.append(item)
    
print("using for loop:",newlist)

# create a new list using comprehension
mylist = [[10,20,30,40,50],[100,200,300,400,500],[1000,2000,3000,4000,5000]]
newlist = [item for innerlist in mylist for item in innerlist]

print("using list comprehension:",newlist)

See Output

Convert two dimensional list into one dimensional list using the if in list comprehension

Program

# create a new list using loop
mylist = [[10,20,30,40,50],[100,200,300,400,500],[1000,2000,3000,4000,5000]]
newlist = []
for innerlist in mylist:
    for item in innerlist:
        if item > 200:
            newlist.append(item)
    
print("using for loop:",newlist)

# create a new list using comprehension
mylist = [[10,20,30,40,50],[100,200,300,400,500],[1000,2000,3000,4000,5000]]
newlist = [item for innerlist in mylist for item in innerlist if item > 200]

print("using list comprehension:",newlist)

See Output

Convert two dimensional list into one dimensional list using the if-else in list comprehension

Program

# create a new list using loop
mylist = [[10,20,30,40,50],[100,200,300,400,500],[1000,2000,3000,4000,5000]]
newlist = []
for innerlist in mylist:
    for item in innerlist:
        if item > 200:
            newlist.append(item)
        else:
            newlist.append(item*item)
    
print("using for loop:",newlist)

# create a new list using comprehension
mylist = [[10,20,30,40,50],[100,200,300,400,500],[1000,2000,3000,4000,5000]]
newlist = [item if item > 200 else item*item for innerlist in mylist for item in innerlist ]

print("using list comprehension:",newlist)

See Output

Create a list of class variable using comprehension

Program

class A:
    name="Atul"
    city="Buxar"
    
class B:
    name="Mohit"
    city="Delhi"
    
class C:
    name="Rahul"
    city="Patna"
    
userlist = [A(),B(),C()]

newuserlist = []
for obj in userlist:
    user = {}
    user["name"] = obj.name
    user['city'] = obj.city
    newuserlist.append(user)

print(newuserlist)

# using comprehension
newuserlist = []
newuserlist = [{"name":obj.name,"city":obj.city}for obj in userlist]
print(newuserlist)

See Output

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