Related links for this tutorial could be found HERE

Make Your Calculator Works Like a Program

Now you already get the result for your own character, but you friend says: “Hey, brother. My team want to explore the new dungeon this week and we have 25 characters. Would you please help us decide the equipment for each team member to wear?

You tried to rewrite the function 25 times in Part A but drove crazy when the third time you type the same thing again.

‘God! I need a function to help me treat with those data in batch!’ You cried out.

Well, that is why people use function in programs. In python, a function is represented as def function_name(variable1, variable2...)

variables are the things that waits you to input yourself. It could be empty, like this:

def printhelloworld():
    print('hello World')

If you execute printhelloworld() the function will print ‘hello World’ on the screen.

The function with input variables looks like this:

def printhellosb(name):
    print('hello ' + name)

The function will print ‘hello John’ if you execute printhellosb('John') and ‘hello Allen’ for printhellosb('Allen').

There will be an error if executing printhellosb(John), because now John is an unknown variable, instead of a string. The thing you input should be a known variable. In case printhellosb(John), computer confused about ‘Who is John’ unless you tell it John = ‘John’. The following command will run successfully:

John = 'John'
printhellosb(John)

Ofcourse you can write a function which receives multiple variables:

def printhelloguys(name1, name2):
    print('hello' + name1 + ' and ' + name2)

printhelloguys('John', 'Allen') shows ‘hello John and Allen’ on your screen.

Now back to our calculator.

The code we got from the last tutorial is:

use_eq_a = (800 + 200) * (1 + 0.05 + 0.1)
print('DMG if use a ' + str(use_eq_a))

use_eq_b = (800 + 100) * (1 + 0.05 + 0.2)
print('DMG if use using b ' + str(use_eq_b))

if use_eq_a > use_eq_b:
    print('choose a')
elif use_eq_a < use_eq_b:
    print('choose b')
else:
    print('two equipments are the same')

Now try to pack everything up into a function, analyze the previous code

From the given condition in Part A which says:

Assume your hero already have:

Atk: 800
EDM: 5%

And the code we written, We can conclude that:

1. 800 in the red box represents the origional attack(before wearing equipments) of your character
2. 0.05 in the blue box represents the origional Extra Damage Multiplier

So your function could be

def HeroEquipChoose(ori_atk, ori_edm):
    logics...
```python
`HeroEquipChoose`, `ori_atk`, `ori_edm` could be any name you want, it just works like a sign. You can also set your function as:
```python
def doggy(a, b):
    logics...

If it not confuse you and others who will read your code.

Simply replace 800 and 0.05 by variable names you want, and that is the function:

def HeroEquipChoose(ori_atk, ori_edm):
    use_eq_a = (ori_atk + 200) * (1 + ori_edm + 0.1)
    print('DMG if use a ' + str(use_eq_a))

    use_eq_b = (ori_atk + 100) * (1 + ori_edm + 0.2)
    print('DMG if use using b ' + str(use_eq_b))

    if use_eq_a > use_eq_b:
        print('choose a')
    elif use_eq_a < use_eq_b:
        print('choose b')
    else:
        print('two equipments are the same')

You may get confused about how to use it. In VSCode, simply use

if __name__ == '__main__':
    functionname(input1, input2...)

and methods we mentioned in Part A to run or you can even get rid of if __name__ == '__main__': , use functionname(input1, input2...) straightly, just like this:

Now you can do the analyze in a more easier way, the following picture shows the result of anayzing 4 characters in your friend’s team.

You can get rid of lines that you don’t want by adding # ahead of the line, and that line will not execute while running.

The line print('DMG if use a ' + str(use_eq_a)) and line print('DMG if use using b ' + str(use_eq_b)) will not run, your terminal just print the clean result without extra messages.

Now you almost finished 2/3 work of batch-data processing, in the next tutorial, you will learn how to put data in a list and print it one-by-one or export them to a file.

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