Use Python’s print() command when you want a program to show a value or message to someone. In an IPython console, typing 3 + 2 lets you peek at its value; typing print(3 + 2) displays 5 as program output, without the console’s Out[] label. section 3.2
Print a value
Try print(13 - 1). Python evaluates 13 - 1 first, then prints 12. You can also print text with print("hello!"). The value inside the parentheses does not have to be a string. section 11.1
To print several values at once, separate them with commas: print(1, "/", 2, "=", 0.5) displays 1 / 2 = 0.5. Python adds spaces between those values. If you need 1/2=0.5 instead, convert the values to strings and join them before printing. section 11.1
Listing 11.2. Printing multiple objects
a = 1 #1 b = 2 #1 c = a/b #2 print(a,"/",b,"=",c) #3 add = str(a)+"/"+str(b)+"="+str(c) #4 print(add) #5
Compare the comma-separated print call with the string built using str() and +. Both show the division result, but only the first adds spaces automatically. section 11.1
In a longer program, print can label calculated results—such as Hours and Minutes—or tell a player which commands a game accepts. Quick check: what appears when you run print(0), and how is that different from typing 0 alone in the IPython console? section 6.2 section 15.1 section 3.2
