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change dtype python

# change the dtype to 'float64'
arr = [1,2,3]
arr = arr.astype('float64')
  
# Print the array after changing
# the data type
print(arr)
  
# Also print the data type
print(arr.dtype)
Comment

pandas change dtype

# Individual  
df['a'] = df_test['a'].astype('float64')
df['b'] = df_test['b'].astype('int64')
# Batch
dtype_d = {"a": "float64", "b": "int64"} # dtype dictio
df = df.astype(dtype_d)
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