Adventures in Minecraft, 2nd Edition

Appendix B

Quick Reference

Table 1 Python input, output, variables
Leaving reminders by using comments	Using constants
# whole-line comment print("hello") # end-of-line comment	SIZE = 100 # upper case name
Printing to the screen	Reading from the keyboard (Python V3)
print(10) # print a number print("hello") # print a string print(a) # print a variable	name = input("your name?") age = int(input("how old?"))
Storing values in variables	Using Boolean variables
a = 10 # an integer (whole) number b = 20.2 # a decimal number message = "hello" # a string finished = True # a Boolean high_score = None # no value	anotherGo = True while anotherGo: choice = int(input("choice?")) if choice == 8: anotherGo = False
Converting strings to (integer) numbers	Converting numbers to strings
size = int(size) size = size + 1	age = str(age) print("Your age is " + age)
Calculating with number variables	Calculating absolute values and differences
b = a + 1 # addition c = a - 1 # subtraction d = a * 2 # multiplication e = a / 2 # division f = a % 2 # remainder after division	absolute = abs(-1) # absolute is 1 difference = abs(x1-x2) smallest = min(x1, x2) largest = max(x1, x2)

Table 2 Python loops
Looping	Using counted loops
a = 0 while a<100: print(a) a = a + 1	for a in range(10): print(a) # 0..9 for a in range(5, 50, 5): print(a) # 5..45 in steps of 5
Looping through all characters in a string	Splitting comma-separated strings
name = "Charlotte" for ch in name: print(ch)	line = ...