v Function Basics - Python

# Function Basics

## Create Function Called print_max

```def print_max(x, y):
# if a is larger than b
if x > y:
# then print this
print(x, 'is maximum')
# if a is equal to b
elif x == y:
# print this
print(x, 'is equal to', y)
# otherwise
else:
# print this
print(y, 'is maximum')
```

## Run Function With Two Arguments

```print_max(3,4)
```
```4 is maximum
```

Note: By default, variables created within functions are local to the function. But you can create a global function that IS defined outside the function.

## Create Variable

```x = 50
```

## Create Function Called Func

```# Create function
def func():
# Create a global variable called x
global x

# Print this
print('x is', x)

# Set x to 2.
x = 2

# Print this
print('Changed global x to', x)
```

## Run func()

```func()
```
```x is 50
Changed global x to 2
```

```x
```
```2
```

## Create Function Say() Displaying x with default value of 1

```# Create function
def say(x, times = 1, times2 = 3):
print(x * times, x * times2)

# Run the function say() with the default values
say('!')

# Run the function say() with the non-default values of 5 and 10
say('!', 5, 10)
```
```! !!!
!!!!! !!!!!!!!!!
```

## VarArgs Parameters (i.e. unlimited number of parameters)

• * denotes that all positonal arguments from that point to next arg are used
• ** dnotes that all keyword arguments from that point to the next arg are used
```# Create a function called total() with three parameters
def total(initial=5, *numbers, **keywords):
# Create a variable called count that takes it's value from initial
count = initial
# for each item in numbers
for number in numbers:
# add count to that number
count += number
# for each item in keywords
for key in keywords:
# add count to keyword's value
count += keywords[key]
# return counts
return count

# Run function
total(10, 1, 2, 3, vegetables=50, fruits=100)
```
```166
```