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Python map() and lambda() Use Cases and Examples

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 In Python, map() and lambda functions are often used together for functional programming. Here are some examples to illustrate how they work. Python map and lambda top use cases 1. Using map() with lambda The map() function applies a given function to all items in an iterable (like a list) and returns a map object (which can be converted to a list). Example: Doubling Numbers numbers = [ 1 , 2 , 3 , 4 , 5 ] doubled = list ( map ( lambda x: x * 2 , numbers)) print (doubled) # Output: [2, 4, 6, 8, 10] 2. Using map() to Convert Data Types Example: Converting Strings to Integers string_numbers = [ "1" , "2" , "3" , "4" , "5" ] integers = list ( map ( lambda x: int (x), string_numbers)) print (integers) # Output: [1, 2, 3, 4, 5] 3. Using map() with Multiple Iterables You can also use map() with more than one iterable. The lambda function can take multiple arguments. Example: Adding Two Lists Element-wise list1 = [ 1 , 2 , 3 ]
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How to Check If Statement Multiple Conditions in Python and Ensure Tidy Code

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Here're examples for Python multiple if conditions (statements). These are useful for interviews and projects. Many programmers confuse to write IF logic in Python. Below examples useful for your quick reference.


Python IF Statements Multiple Conditions Examples

Multiple IF Conditions

  1. IF, IF
  2. IF 'ELSE'
  3. IF 'or'
  4. IF 'and'
  5. Nested IF
  6. IF 'continue'
  7. IF 'break'

In Python, the decision-making logic you can write with IF condition. You can write multiple IF conditions (Single way decision). At the same time, you can write IF and ELSE conditions (Two-way decision).


Multiple IF conditions the best example.

def main(): 
       celsius = float(input("What is the Celsius temperature? ")) 
       fahrenheit = 9/5 * celsius + 32 
       print("The temperature is", fahrenheit, "degrees Fahrenheit.")
 # Print warnings for extreme temps 
     if fahrenheit > 90: 
          print("It's really hot out there. Be careful!") 
     if fahrenheit < 30: 
          print("Brrrrr. Be sure to dress warmly!")
 

Note:  Writing IF conditions like this we call it a Single way of Decision. 

IF-Else condition the best example.


def main(): 
      print("This program finds the real solutions to a quadratic\n") 
      a = float(input("Enter coefficient a: ")) 
      b = float(input("Enter coefficient b: ")) 
      c = float(input("Enter coefficient c: ")) 
      discrim = b * b - 4 * a * c 
     if discrim < 0: 
          print("\nThe equation has no real roots!") 
     else: 
         discRoot = math.sqrt(b * b - 4 * a * c) 
         root1 = (-b + discRoot) / (2 * a) 
         root2 = (-b - discRoot) / (2 * a) 
         print("\n The solutions are:", root1, root2

Note: Writing IF conditions like this we call it Two way of Decision.

 

Nested IF condition the best example.

if condition:
	if condition:
		statements
	else:
		statements
else:
statements


IF Continue condition the best example.


Notes: 'Continue' just continue the next iteration of the loop.

>>> for num in range(2, 10):
...     if num % 2 == 0:
...         print "Found an even number", num
...         continue
...     print "Found a number", num
Found an even number 2
....
 

IF break conditions the best example.


>>> for n in range(2, 10):
...     for x in range(2, n):
...         if n % x == 0:
...             print n, 'equals', x, '*', n/x
...             break
...     else:
...         # loop fell through without finding a factor
...         print n, 'is a prime number'
...
 

IF True Best Example.


flag = True
if flag:
    print("Welcome")
    print("To")
    print("BeginnersBook.com")

IF 'and' the Best Example.

if((a>b and a>c) and (a != b and a != c)): 
    print(a, " is the largest") 
elif((b>a and b>c) and (b != a and b != c)): 
    print(b, " is the largest") 
elif((c>a and c>b) and (c != a and c != b)): 
    print(c, " is the largest") 
else: 
    print("entered numbers are equal"
 

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