Matplotlib is the whole package； pylabisamoduleinmatplotlibthatgetsinstalledalongsidematplotlib； andmatplotlib.pyplotisamoduleinmatplotlib。
pyplotprovidesthestate-machineinterfacetotheunderlyingplottinglibraryinmatplotlib.thismeansthatfiguresandaxesareimplicitly esiredplot.forexample，callingplotfrompyplotwillautomaticallycreatethenecessaryfigureandaxestoachievethedesiredplot.setiredplot
pylabcombinesthepyplotfunctionality (for plotting ) withthenumpyfunctionality (formathematicsandforworkingwitharrays )。 in a single namespace，makingthatnamespace (or environment ) even more MATLAB-like. For example，onecallthesinandcosfunctionctionatione
thepyplotinterfaceisgenerallypreferredfornon -交互打印(I.e .scripting ).thepylabinterfaceisconvenientforient asitminimizestyping.notethatthisiswhatyougetifyousetheipythonshellwiththe-pylaboption，whimportseverythingfrompylabantion