Python 9b - Number Handling
Rounding Numbers
The round() command is used to round a value to a certain number of decimal places.
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Type your variable into the round command brackets, add a comma and state the number of decimal places to round to.
If you type only the variable, it will round the number to the nearest whole value.
Practice Task 1
Ask the user to enter any large number.
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Ask the user to enter another large number.
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Divide the two numbers and print the answer to 3 decimal places.
Example solution:
Using Numbers as Strings
The following techniques all require the integer to be converted into a string first using the str command.
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Just like a string, you can shorten a variable to only display a certain length.
Remember that Python starts at zero.
You can select a specific digit in the same manner as when selecting characters in a string.
If you want to use your variable as an integer again later you would need to convert it from a string to an integer using the int command.
Again, reversing a number is the same as reversing a string.
You can also use other string handling methods such as .startswith() or .endswith()
Practice Task 2
Ask the user to enter a 10 digit number.
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Select the 2nd and 8th digits and add them together.
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Print the total.
Example solution:
