Python | Get positive elements from given list of lists

Given a list of list, the task is to get only positive element from given list. Below are some ways to solve the above problem.

Method #1: Using Iteration

# Python code to get positive  
# element from list of list 
  
# List Initialisation 
Input = [[10, -11, 222], [42, -222, -412, 99, -87]] 
Output = [] 
  
# Using iteration 
for elem in Input: 
    temp = [] 
    for x in elem: 
        if x>0: 
            temp.append(x) 
    Output.append(temp) 
    
# printing output 
print("Initial List is :", Input) 
print("Modified list is :", Output) 

Output:

Initial List is : [[10, -11, 222], [42, -222, -412, 99, -87]]
Modified list is : [[10, 222], [42, 99]]

Method #2: Using map and list Comprehension

# Python code to get positive element  
# from list of list 
  
# List Initialisation 
Input = [[10, -11, 222], [42, -222, -412, 99, -87]] 
  
# Using list comprehension and map 
temp = map(lambda elem: filter(lambda a: a>0, elem), Input) 
Output = [[a for a in elem if a>0] for elem in temp] 
  
# printing output 
print("Initial List is :", Input) 
print("Modified list is :", Output) 

Output:

Initial List is : [[10, -11, 222], [42, -222, -412, 99, -87]]
Modified list is : [[10, 222], [42, 99]]

Method #3: Using List Comprehension

# Python code to get positive element  
# from list of list 
  
# List Initialisation 
Input = [[10, -11, 222], [42, -222, -412, 99, -87]] 
  
# Using list comprehension 
Output = [ [b for b in a if b>0] for a in Input] 
  
# printing output 
print("Initial List is :", Input) 
print("Modified list is :", Output) 

Output:

Initial List is : [[10, -11, 222], [42, -222, -412, 99, -87]]
Modified list is : [[10, 222], [42, 99]]

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