/Python/Read large SAS file ilarger than memory n Python

Read large SAS file ilarger than memory n Python

import pandas as pd
import pyreadstat
filename = 'foo.SAS7BDAT'
CHUNKSIZE = 50000
offset = 0
allChunk,_ = getChunk(row['filePath'], row_limit=CHUNKSIZE, row_offset=offset)
allChunk = allChunk.astype('category')

while True:
    offset += CHUNKSIZE
    # for xpt data, use pyreadstat.read_xpt()
    chunk, _ = pyreadstat.read_sas7bdat(filename, row_limit=CHUNKSIZE, row_offset=offset)
    if chunk.empty: break  # if chunk is empty, it means the entire data has been read, so break

    for eachCol in chunk:  #converting each column to categorical 
        colUnion = pd.api.types.union_categoricals([allChunk[eachCol], chunk[eachCol]])
        allChunk[eachCol] = pd.Categorical(allChunk[eachCol], categories=colUnion.categories)
        chunk[eachCol] = pd.Categorical(chunk[eachCol], categories=colUnion.categories)

    allChunk = pd.concat([allChunk, chunk])  #Append each chunk to the resulting dataframe

Source: stackoverflow.com

Similar codes

0 vote138 views1 answer
Splitting strings in Python without split()
Python
2 votes188 views1 answer
Run flask application in development mode stack overflow
Python
2 votes142 views1 answer
Python divide every element in a list by a number
Python
0 vote134 views1 answer
Get token from request django
Python
0 vote127 views1 answer
Merge all mp4 video files into one file python
Python
3 votes156 views1 answer
File manage py line 17 from exc django
Python
2 votes165 views1 answer
Python backslash in string
Python
30 votes139 views6 answers
Try and except in python
Python
5 votes131 views3 answers
How to calculate mean in python
Python
7 votes133 views3 answers
Python open encoding utf-8
Python