Python | Ways to convert array of strings to array of floats

Sometimes in a competitive coding environment, we get input in some other datatypes and we need to convert them in other forms this problem is same as that we have an input in the form of string and we need to convert it into floats.
Let’s discuss a few ways to convert an array of strings to array of floats.

Method #1 : Using astype

# Python code to demonstrate converting  
# array of strings to array of floats 
# using astype 
  
import numpy as np 
  
# initialising array 
ini_array = np.array(["1.1", "1.5", "2.7", "8.9"]) 
  
# printing initial array 
print ("initial array", str(ini_array)) 
  
# conerting to array of floats 
# using np.astype 
res = ini_array.astype(np.float) 
  
# printing final result 
print ("final array", str(res)) 

Output:

initial array ['1.1' '1.5' '2.7' '8.9']
final array [ 1.1  1.5  2.7  8.9]

Method #2: Using np.fromstring

# Python code to demonstrate converting  
# array of strings to array of floats 
# using fromstring 
  
import numpy as np 
  
# initialising array 
ini_array = np.array(["1.1", "1.5", "2.7", "8.9"]) 
  
# printing initial array 
print ("initial array", str(ini_array)) 
  
# conerting to array of floats 
# using np.fromstring 
ini_array = ', '.join(ini_array) 
ini_array = np.fromstring(ini_array, dtype = np.float,  
                                           sep =', ' ) 
  
# printing final result 
print ("final array", str(ini_array)) 

Output:

initial array ['1.1' '1.5' '2.7' '8.9']
final array [ 1.1  1.5  2.7  8.9]

Method #3: Using np.asarray() and type

# Python code to demonstrate 
# converting array of strings to array of floats 
# using asarray 
  
import numpy as np 
  
# initialising array 
ini_array = np.array(["1.1", "1.5", "2.7", "8.9"]) 
  
# printing initial array 
print ("initial array", str(ini_array)) 
  
# conerting to array of floats 
# using np.asarray 
final_array = b = np.asarray(ini_array,  
        dtype = np.float64, order ='C') 
  
# printing final result 
print ("final array", str(final_array)) 

Output:

initial array ['1.1' '1.5' '2.7' '8.9']
final array [ 1.1  1.5  2.7  8.9]

My Personal Notes

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