"from math import sqrt" works but "import math" does not work. What is the reason?
Question: I am pretty new in programming, just learning python.

I'm using Komodo Edit 9.0 to write codes. So, when I write "from math import
sqrt", I can use the "sqrt" function without any problem. But if I only write
"import math", then "sqrt" function of that module doesn't work. What is the
reason behind this? Can I fix it somehow?


Answer: You have two options:

    
    
    import math
    math.sqrt()
    

will import the `math` module into its own namespace. This means that function
names have to be prefixed with `math`. This is good practice because it avoids
conflicts and won't overwrite a function that was already imported into the
current namespace.

Alternatively:

    
    
    from math import *
    sqrt()
    

will import everything from the `math` module into the current namespace.
[That can be problematic](http://stackoverflow.com/a/2360808/2202669).

