Question

I have a numpy array of strings. When a value in the array is undefined, None is printed as you would expect. Is it possible to provide a default value for None values?

e.g. in the following I want “_” instead of None

[[None B C]
 [M None O]
 [X Y None]]

would become

[[_ B C]
 [M _ O]
 [X Y _]]

Answer 1

a simple solution might be to transform your array to string first and then replace the string None afterwards, for example if your matrix is a:

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

you can also define a function:

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