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task_calculator.py
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task_calculator.py
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def calc_str(text, previous):
"""
>>> calc_str('1 + 1', None)
2.0
>>> calc_str('2 * 3', None)
6.0
>>> calc_str('18 % 4', None)
2.0
>>> calc_str('1.5 + 1.5', None)
3.0
>>> calc_str('2 / 3', None)
0.667
>>> calc_str('+ 2', 2)
4.0
#>>> calc_str('')
?
#>>> calc_str('bob is cool')
#ValueError:
"""
items = text.split()
if len(items) == 2:
number1 = float(previous)
operator = items[0]
number2 = float(items[1])
else:
number1 = float(items[0])
operator = items[1]
number2 = float(items[2])
answer = None
#aa = {'0':'bob', "1":'jane', "2":'sally'}
#aa["1"]
import operator
ops = {
'+': operator.add,
'*': operator.mul,
#'plus': operator.add,
}
#alias = (
# (operator.add, ('plus', 'PLUS', 'pp', '+'))
#)
answer = ops[operator](number1, number2)
#if (operator == '+'):
# answer = number1 + number2
#if (operator == '*'):
# answer = number1 * number2
#if (operator == '%'):
# answer = number1 % number2
#if (operator == '/'):
# answer = number1 / number2
return round(answer, 3)
if __name__ == '__main__':
previous = None
while True:
text = input('>>> ')
answer = calc_str(text, previous)
previous = answer
print(answer)