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A board represents square sized table with columns named with numbers and rows named with chars as following:
| | 1 | 2 | 3 |...
|a| | | |...
|b| | | |...
|c| | | |...
.
.
.
Each field is corresponding to specific coordinate this way: a1 -> (0, 0); a2 -> (0, 1), ..., c2 -> (2, 1), c3 -> (2, 2) ...
Size of square board will be less or equal english alphabet's letter count i.e. <= 26. Let's consider that passed parameter is correct and have a value within 'a1'..'z26'.
Your task is to write a function which accepts a field parameter in string representation for example 'a1' and return a tuple respresenting a corresponding coordinate - (rowIndex, columnIndex), e.g. if there was passed 'c1' then result should be (2, 0).
import re
def field_to_coordinate(field):
# Compute a coordinate which represents specified `field`,
# i.e. if field = 'd2' returned value should be [3, 1]
x, y = re.search(r"([^\d])(\d+)", field).groups()
return (ord(x) - 97, int(y) - 1)test.assert_equals(field_to_coordinate('c1'), (2, 0))
test.assert_equals(field_to_coordinate('d2'), (3, 1))
test.assert_equals(field_to_coordinate('f5'), (5, 4))