What will we cover?
We will cover what a program flow is, how this links to conditional statements and boolean expressions.
Step 1: Let’s recall what boolean expressions are
Boolean expression is the building block of conditional statements. So let’s make a brief recap of it.
Given two variables a and b, we have the following boolean expressions with them.
- Equals: a == b
- Not Equals: a != b
- Less than: a < b
- Less than or equal to: a <= b
- Greater than: a > b
- Greater than or equal to: a >= b
Where depending on the values in a and b the expressions will evaluate to True of False.
Step 2: Conditional statements
Let’s demonstrate a few if-statements here.
Equality between variables.
a = 10 b = 10 if a == b: print("a equals b")
Notice, that if a was not equal b, then it would not print the statement. That is, the indented code after the if-statement, is only executed if the boolean expression evaluates to True.
Another example with less-than.
a = 10 b = 8 if a < b: print("a is less than b")
Again the same principles applies.
You can also have an else-clause.
a = 12 b = 12 if a > b: print("a is greater than b") else: print("a is not greater than b")
And a elif-clause.
a = 13 b = 12 if a > b: print("a is greater than b") elif a == b: print("a is equal to b") else: print("a is less than b")
And a not-equal statement.
a = 10 b = 10 if a != b: print("a does not equal b")
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