Coding strings
Now the next question is: how do you embed an apostrophe into a string placed between apostrophes?
You should already know the answer, or to be precise, two possible answers.
Try to print out a string containing the following message:
I'm Monty Python.
Do you know how to do it? Click Check below to see if you were right:
print('I\'m Monty Python.')
or
print("I'm Monty Python.")
As you can see, the backslash is a very powerful tool - it can escape not only quotes, but also apostrophes.
We've shown it already, but we want to emphasize this phenomenon once more - a string can be empty - it may contain no characters at all.
An empty string still remains a string:
' '
" "
Boolean values
To conclude with Python's literals, there are two additional ones.
They're not as obvious as any of the previous ones, as they're used to represent a very abstract value - truthfulness.
Each time you ask Python if one number is greater than another, the question results in the creation of some specific data - a Boolean value.
The name comes from George Boole (1815-1864), the author of the fundamental work, The Laws of Thought, which contains the definition of Boolean algebra - a part of algebra which makes use of only two distinct values: True and False, denoted as 1 and 0.
A programmer writes a program, and the program asks questions. Python executes the program, and provides the answers. The program must be able to react according to the received answers.
Fortunately, computers know only two kinds of answers:
- Yes, this is true
- No, this is false
You'll never get a response like: I don't know or Probably yes, ut I don't know for sure.
Python, then, is a binary reptile.
These two Boolean values have strict denotiations in Python:
True
False
You cannot change anything - you have to take these symbols as they are, including case-sensitivity.
Challenge: What will the output of the following snippet of code?
print(True > False)
print(True < False)
Run the code in the Sandbo to check. Can you explain the result?
