KwickClips Python · 44 sec · free
Which mode adds a record without erasing?
Short answer. ab, append binary.
What are the three steps of an update?
Read all records, change the matching one, then rewrite with wb.
Which mode?
| Task | Mode | How |
|---|---|---|
| Search | rb | till EOFError |
| Append | ab | dump at end |
| Update | rb, then wb | rewrite all |
Remember
| wb erases old records |
| ab keeps them |
You added a record, and old ones vanished. Why? You used write binary. Search reads to end of file. Append adds at the end. Update reads, edits, rewrites. Remember two things. Write binary erases old records. Append binary keeps them.
This clip is from the full lesson: Binary Files and the pickle Module — 7 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 12 Computer Science (083), CBSE Class 12 Computer Science (083)
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