4.34 Ã10-55 is a proper example because. 1  4.34, which is a in this example, is not smaller than 1 and not larger than 10. 2  10's exponent is the integer -55. Integers can be negative.
The most reliable way to install a Python package is to install it from source via its setup.py script. This will install your Python package into a directory like /Library/Python/2.6/site-packages. The simplest method is using easy_install, a gem or apt-like interface for installing Python packages.
Because PyPNG is written in Python itâs trivial to install into a Python installation, or include in your application (as long as itâs written in Python!). Just use python setup.py install or just copy the code/png.py file. You can even curl it straight into wherever you need it: curl -O http://pypng.googlecode.com/svn/trunk/code/png.py. In fact, I have never managed to install PIL and that was one of the motivating factors for PyPNG.