[Python] How to check if an array is multidimensional

I am trying to write a code to check if n is the maximum of the array A.

If it is return True if it isn't return False, but I have two conditions: if the value is multidimensional or unidimensional.

I don't know how to write that.

if [A is unidimentional]:
maximum=A[0]
for i in range(A.shape[0]):
if max(A,maximum)==A:
maximum=A
if max(n,maximum)!=n:
return False
return True

else:
maximum=A[0][0]
for i in range(A.shape[0]):
for j in range(A.shape[1]):
if max(A[j],maximum)==A[j]:
maximum=A[j]
if max(n,maximum)!=n:
return False
return True


How can I write that conditional logic into my script?

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