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David Beazley
2020-05-27 20:40:21 -05:00
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Notes/01_Introduction/03_Numbers.md
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[Contents](../Contents) \| [Previous (1.2 A First Program)](02_Hello_world) \| [Next (1.4 Strings)](04_Strings)
# 1.3 Numbers
This section discusses mathematical calculations.
### Types of Numbers
Python has 4 types of numbers:
@@ -27,7 +31,7 @@ if d == 0:
print('d is False')
```
*Don't write code like that. It would be odd.*
*But, don't write code like that. It would be odd.*
### Integers (int)
@@ -47,9 +51,9 @@ Common operations:
x + y Add
x - y Subtract
x * y Multiply
x / y Divide
x // y Floor Divide
x % y Modulo
x / y Divide (produces a float)
x // y Floor Divide (produces an integer)
x % y Modulo (remainder)
x ** y Power
x << n Bit shift left
x >> n Bit shift right
@@ -165,12 +169,18 @@ Try it out.
## Exercises
Reminder: These exercises assume you are working in the `practical-python/Work` directory. Look
for the file `mortgage.py`.
### Exercise 1.7: Dave's mortgage
Dave has decided to take out a 30-year fixed rate mortgage of $500,000 with Guido’s Mortgage, Stock Investment, and Bitcoin trading corporation.
The interest rate is 5% and the monthly payment is $2684.11.
Dave has decided to take out a 30-year fixed rate mortgage of $500,000
with Guido’s Mortgage, Stock Investment, and Bitcoin trading
corporation. The interest rate is 5% and the monthly payment is
$2684.11.
Here is a program that calculates the total amount that Dave will have to pay over the life of the mortgage:
Here is a program that calculates the total amount that Dave will have
to pay over the life of the mortgage:
```python
# mortgage.py
@@ -238,7 +248,7 @@ While you’re at it, fix the program to correct the for overpayment that occurs
`int()` and `float()` can be used to convert numbers. For example,
```pycon
```python
>>> int("123")
123
>>> float("1.23")
@@ -248,7 +258,7 @@ While you’re at it, fix the program to correct the for overpayment that occurs
With that in mind, can you explain this behavior?
```pycon
```python
>>> bool("False")
True
>>>