Clever Geek Handbook

Converting Scientific Notation to Decimals

I have numbers in a file (like strings) in scientific notation, for example:

8.99284722486562e-02

but I want to convert them to:

0.08992847

Is there a built in function or any other way to do this?

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3 answers


I'm sure you can do it with



float("8.99284722486562e-02")
# and now with 'rounding'
"{:.8f}".format(float("8.99284722486562e-02"))
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Scientific notation can be converted to floating point number float

.

In [1]: float("8.99284722486562e-02")


Out [1]: 0.0899284722486562



float

can be rounded with format

and then float

can be used in a string to return the final rounded float.

In [2]: float("{:.8f}".format(float("8.99284722486562e-02")))


Out [2]: 0.08992847

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As you know, floating point numbers have precision issues. For example, evaluate:

>>> (0.1 + 0.1 + 0.1) == 0.3
False

You can use the Decimal class instead . In python interpreter:

>>> import decimal
>>> tmp = decimal.Decimal('8.99284722486562e-02')
Decimal('0.0899284722486562')
>>> decimal.getcontext().prec = 7
>>> decimal.getcontext().create_decimal(tmp)
Decimal('0.08992847')
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