python - numpy - pretty printing -

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i have numpy array of strings. when value in array undefined, none printed expect. possible provide default value none values?

e.g. in following want "_" instead of none

[[none b c]  [m none o]  [x y none]]

would become

[[_ b c]  [m _ o]  [x y _]]

a simple solution might transform array string first , replace string none afterwards, example if matrix a:

print(str(a).replace('none','_'))

you can define function:

def printarray(a):      print(str(a).replace('none','_'))

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