If you receive a lock error on read_sav() , use fs::file_copy() as in the Python method. Method 5: Using PSPP (Open-Source Alternative) PSPP, a free SPSS clone, often handles locks more gracefully and allows editing active files in certain scenarios.
import pyreadstat, os, shutil def safe_edit_sav(original_path, modify_func): temp = original_path + ".temp.sav" shutil.copy2(original_path, temp) df, meta = pyreadstat.read_sav(temp) df = modify_func(df) # your custom edit logic pyreadstat.write_sav(df, original_path + ".new.sav", metadata=meta) print(f"Edit complete. Close original_path's owner, then replace manually.") safe_edit_sav(r"C:\data\report.sav", lambda df: df.assign(new=df.old * 2)) How To Edit Active Sav File
SAVE OUTFILE = 'C:\data\original_modified.sav'. The active dataset resides in RAM. Disk locking prevents other programs from writing, but SPSS itself retains the right to overwrite its own open file. This is the only true "edit active SAV" scenario. Method 2: Copy-On-Write (Python) When you cannot close the program holding the lock (e.g., a long-running analysis), use copy-on-write . If you receive a lock error on read_sav()
library(haven) library(dplyr) df <- read_sav("data.sav") Modify in memory df <- df %>% mutate(income_adj = income * 0.85) %>% zap_labels() # remove labels if interfering Write to a new file write_sav(df, "data_modified.sav") If you need to replace the original, first: 1. Close any other program holding the lock 2. Run: file.remove("data.sav") file.rename("data_modified.sav", "data.sav") Close original_path's owner, then replace manually