user input value to use as decimal value python

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悲哀的现实
悲哀的现实 2021-01-25 02:49

I am writing a python code where I ask the user for input and then I have to use their input to give the number of decimal places for the answer to an expression.



        
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  • 2021-01-25 03:11

    When formatting your print statement you can specify the number of significant figures to display. For example '%.2f' % float_value will display two decimal places. See this question for a more detailed discussion.

    You want something like this:

    import math
    
    xx = .2
    
    userDecimals = raw_input (" Enter the number of decimal places you would lik    e in the final answer: ")
    userDecimals = int(userDecimals)
    
    fmt_str = "%."+str(userDecimals)+"f"
    
    print fmt_str % math.sqrt(1 - xx **2)
    

    Outputs:

    Enter the number of decimal places you would like in the final answer: 5
    0.97980
    
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  • 2021-01-25 03:22

    Use string formatting and pass userDecimals to the precision part of the format specifier:

    >>> import math
    >>> userDecimals = 6
    >>> '{:.{}f}'.format(math.sqrt(1 - .1 **2), userDecimals)
    '0.994987'
    >>> userDecimals = 10
    >>> '{:.{}f}'.format(math.sqrt(1 - .1 **2), userDecimals)
    '0.9949874371'
    
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