PYTHONPATHとはPYTHONPATH とはなにか，とその設定方法について Python の Documentation » Python Setup and Usageより: Augment the default search path for module files. The format is the same as the shell’s PATH: one or more directory pathnames separated by os.pathsep (e.g. colons on Unix or semicolons on Windows). Non-existent directories are silently ignored.（中略）The default search path is installation dependent, but generally begins
