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Example result
Code review: Python order-import script for a small online shop
What the code does
- Reads
orders.csvfrom the shop export. - For each order line, finds the product by SKU in
stock.xlsxand subtracts the quantity. - Writes the updated stock back and logs totals to
import_log.txt.
The structure is clear and functions are well named. Most issues are about input that does not look the way the script expects.
Bugs and weak spots
| # | Line | Severity | Issue |
|---|---|---|---|
| 1 | 48 | High | The same CSV can be imported twice; there is no check for already processed order IDs. This is the most likely cause of negative stock. |
| 2 | 72 | High | int(row["qty"]) crashes on empty or "2.0" values from refunded orders. |
| 3 | 95 | Medium | SKU lookup is case-sensitive: "gt-101" and "GT-101" are treated as different products. |
| 4 | 130 | Medium | The file is opened without encoding="utf-8", so product names with accents break on Windows. |
| 5 | 201 | Low | Bare except: hides real errors and makes the log useless. |
Corrected fragments
Issue 1: skip orders already imported
processed = load_processed_ids("processed_orders.txt")
for row in reader:
if row["order_id"] in processed:
continue
# ... existing logic ...
processed.add(row["order_id"])
save_processed_ids("processed_orders.txt", processed)
Why: each order is applied once, even if you run the script on the same file again.
Issue 2: read quantity safely
raw = (row.get("qty") or "").strip()
try:
qty = int(float(raw))
except ValueError:
log.warning("Order %s: bad quantity %r, skipped", row["order_id"], raw)
continue
Why: refunded or partial lines are skipped with a clear note instead of stopping the whole import.
Issue 3: normalise SKUs
sku = row["sku"].strip().upper()
Apply the same .strip().upper() when building the stock dictionary.
Style and readability
process()is 90 lines long; split it intoread_orders,apply_to_stock,write_report.- Replace magic column numbers (
row[7]) with header names.
Please test each fix on a copy of your files: we read the code but did not run it.
Client: owner of a tea shop who wrote a 310-line Python script that imports orders from a CSV export into the stock spreadsheet Problem reported: "Sometimes stock goes negative, and the script crashes on some files."
The client and all details are made up.
About this service
When you inherit code from a developer who has left, the first job is understanding it: what each part does, which pieces depend on each other and which lines nobody should touch without care. We read the code you paste, explain it in plain words section by section, and write comments you can add to the files. We also mark dead code, hidden side effects and risky spots, so you know where to be careful before changing anything.
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- Plain explanationsSection by section
- Ready commentsTo paste into the files
- Risky spotsSide effects, dead code, magic numbers
- Suggested fixesCorrected fragments where needed
How it works
- 1BriefYou paste the code and your goal
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What we need from you
The inherited code pasted as text or screenshots, the language and version, what the system is used for and what you need to change in it soon.
We will ask you:
- Which language and version is the code in?
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- Is there any documentation or are there notes from the previous developer?
Compare packages
| Packages | BasicCode up to 100 lines$15 | StandardCode up to 400 lines$35 | PremiumUp to 1,000 lines with a clean-up order$69 |
|---|---|---|---|
| Deadline | 1 day | 2 days | 3 days |
| Revisions | 1 | 2 | 3 |
| Lines of code | up to 100 | up to 400 | up to 1,000 |
| Corrected fragments | Yes | Yes | Yes |
| Step-by-step clean-up order | No | No | Yes |
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Questions and answers
Do you run my code?
No. We read it carefully and reason about how it behaves, but we do not execute it, so test every suggested fix in your own project.
Can you rewrite it in a modern language?
This service explains and annotates your code and suggests fixes. A full rewrite is a separate development project.
The code is very old. Is that a problem?
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