Python code neither running proper nor showing errors in VS Code

Your script:

• misses a ()
• uses an unknown name Unit
• tries to add string and numbers : print("Weight in pounds: " + weight)
• does the pound calculation wrong
• uses () where not applicable
• uses else if ... :

weight = int(input("Enter weight: ")) unit = input("(K)kilograms or (P)pounds? ") if unit.upper == "P": # unit.upper() (weight*=1.6) # ( ) are wrong, needs / print("Weight in kilograms: " + weight) # str + float? else if Unit=="K": # unit ... or unit.upper() as well (weight*=1.6) # ( ) are wrong print("Weight in pounds: " + weight) # str + float else: print("ERROR INPUT IS WRONG!") 

You can simply use .upper() directly with your input:

# remove whitespaces, take 1st char only, make upper unit = input("(K)kilograms or (P)pounds? ").strip()[0].upper() 

Even better probably:

weight = int(input("Enter weight: ")) while True: # look until valid unit = input("(K)kilograms or (P)pounds? ").strip()[0].upper() if unit in "KP": break else: print("ERROR INPUT IS WRONG! K or P") if unit == "P": weight /= 1.6 # fix here need divide print("Weight in kilograms: ", weight) # fix here - you can not add str + int else: weight *= 1.6 print("Weight in pounds: ", weight) 

You should look into str.format:

 print("Weight in pounds: {:.03f}".format(weight)) # 137.500 

see f.e. Using Python's Format Specification Mini-Language to align floats