whencopyinglargefilesusingshutil.copy (，yougetnoindicationofhowtheoperationisprogressing .
ihaveputtogethersomethingthatworks-itusesasimpleprogressbarclass (whichsimplereturnsasimpleasciiprogressssbar，as a string )， andaloopofopen(.read ) ) and .write ) ) todotheactualcopying.itdisplaystheprogressbarusingsys.stdout.write () )
youcanseethecode(incontext ) on github here
isthereanybuilt-inmodulethatwilldothisbetter？ isthereanyimprovementsthatcanbemadetothiscode？
Two things:
iwouldmakethedefaultblocksizealotlargerthan 512.iwouldstartwith 16384 andperhapsmore。
For modularity，itmightbebettertohavethecopy _ with _ progfunctionnotoutputtheprogressbaritself，butcallacallbackfunctionso
Perhaps something like this:
defcopy_with_Prog(src，dest，callback=None ) :
while True:
#复制loop stuff
if callback:
呼叫后退(销售点，总) )。
Prog=Progressbar(…)
复制_ with _ Prog (src，dest，lambda pos，total:Prog.update ) pos，total )