KnowCardPython · Functions: Parameters & Scope
In a function definition, where must parameters with default values be placed, and why?
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What does this print?
```
def f(x, acc=[]):
acc.append(x)
return acc
print(f(1))
print(f(2))
```
When is a parameter's default value expression actually evaluated?
What does this print?
```
def f(a=[1, 2, 3]):
a += [4, 5]
print(a)
f()
f()
```
A function ends without ever executing a return statement. What does calling it evaluate to?
What does this print, and why?
```
def my_sum(a, b, c=0, d=0):
return a + b + c + d
print(my_sum(d=1, b=3, c=2, a=1))
```
Is this call legal? Why or why not?
```
def my_sum(a, b, c=0, d=0):
return a + b + c + d
my_sum(1, c=10, 2)
```
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