## V 

value default parameter , 101 value of an object , 17 ValueError exception , 76 values $_{writing}$, 83 variable $_{free}$, 45 variable annotation , 128 virtual environment , 128 virtual machine , 128 

## W 

while statement , 90, 96 Windows , 105 with statement , 41, 99 writing values , 83 

## X 

xor $_{bitwise}$, 76 

## Y 

yield examples , 69 $_{expression}$, 67 $_{keyword}$, 67 statement , 88 

## Z 

Zen of Python , 128 ZeroDivisionError $_{exception}$, 75 

