Python | numpy.isnat() method Last Updated : 27 Sep, 2019 Summarize Comments Improve Suggest changes Share Like Article Like Report With the help of numpy.isnat() method, we can get the boolean value as true if date defined in a np.datetime64() method is not a time by using numpy.isnat() method. Syntax : numpy.isnat() Return : Return the boolean value if time is not found. Example #1 : In this example we can see that by using numpy.isnat() method, we are able to get the boolean value if time is not found in np.datetime64() method. Python3 1=1 # import numpy import numpy as np # using numpy.isnat() method gfg = np.isnat(np.datetime64("Nat")) print(gfg) Output : True Example #2 : Python3 1=1 # import numpy import numpy as np # using numpy.isnat() method gfg = np.isnat(np.datetime64("1998-01-01")) print(gfg) Output : False Comment More infoAdvertise with us Next Article numpy.isnan() in Python J jitender_1998 Follow Improve Article Tags : Python Python-numpy Practice Tags : python Similar Reads Python | numpy.isin() method With the help of numpy.isin() method, we can see that one array having values are checked in a different numpy array having different elements with different sizes. Syntax : numpy.isin(target_array, list) Return : Return boolean array having same size as of target_array. Example #1 : In this example 1 min read Python | numpy.lookfor() method With the help of numpy.lookfor() method, we can get the information about the module in the numpy by using numpy.lookfor() method. Syntax : numpy.lookfor(module_name) Return : Return the information about the module. Example #1 : In this example we can see that by using numpy.lookfor() method, we ar 1 min read numpy.nonzero() in Python numpy.nonzero() function returns the indices of the elements in an array that are non-zero. It is commonly used to find the positions of non-zero (or True) elements in arrays.Example:Pythonimport numpy as np a = np.array([0, 2, 0, 3, 0, 4]) res = np.nonzero(a) print(res)Output(array([1, 3, 5]),) Exp 2 min read numpy.isnan() in Python The numpy.isnan() function tests element-wise whether it is NaN or not and returns the result as a boolean array. Syntax :Â numpy.isnan(array [, out]) Parameters :Â array : [array_like]Input array or object whose elements, we need to test for infinity out : [ndarray, optional]Output array placed wit 2 min read Python | sympy.is_number method With the help of sympy.is_number method, we can check if element is number or not and it will return a boolean value if number is found by using sympy.is_number method. Syntax : sympy.is_number Return : Return a boolean value if number is found. Example #1 : In this example we can see that by using 1 min read numpy.isfinite() in Python The numpy.isfinite() function tests element-wise whether it is finite or not(not infinity or not Not a Number) and return the result as a boolean array. Syntax :Â numpy.isfinite(array [, out]) Parameters :Â array : [array_like]Input array or object whose elements, we need to test for infinity out : 2 min read Like