python-numpy最全攻略八-count, rfind, isnumeric

22. numpy.count()

import numpy as np
a=np.array(['geeks', 'for', 'geeks'])
# counting a substring
print(np.char.count(a,'geek'))
# This function returns the number of occurrences of a substring in the given string
# counting a substring
print(np.char.count(a, 'fo'))

[1 0 1]
[0 1 0]

23. numpy.rfind()

import numpy as np
# This function returns the highest index of the substring if found in given string.
# If not found then it returns -1
a=np.array(['geeks', 'for', 'geeks'])
# counting a substring
print(np.char.rfind(a,'geek'))
# counting a substring
print(np.char.rfind(a, 'fo'))

[ 0 -1
0]
[-1
0 -1]

24. numpy.isnumeric()

# This function returns “True” if all characters in the string are numeric characters,
# Otherwise, It returns “False”.
import numpy as np
# counting a substring
print(np.char.isnumeric('geeks'))
# counting a substring
print(np.char.isnumeric('12geeks'))
print(np.char.isnumeric('12'))

False
False
True

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