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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
TypeScript only protects you when the types say what the code really does, and many projects slowly fill up with any, unchecked type assertions and optional fields that are never really optional. We read your code and type definitions, explain the compiler errors you are stuck on, and show where narrowing, union types or a small generic would replace a cast. Corrected fragments keep the strict mode in mind, so the fixes hold up when the compiler gets stricter.
What is included
- What you getA written review on the order page: compiler errors explained, weak types listed by risk, and corrected fragments with better type definitions. Premium adds a plan for turning on stricter compiler options step by step.
- Compiler errors decodedLong messages in plain words
- Fewer any and castsSafer types in their place
- Narrowing and unionsLet the compiler check branches
- Interfaces and genericsReusable, readable type definitions
- Fixed fragmentsWith a note on each change
How it works
- 1BriefYou paste code, types and errors
- 2ReadingWe check types against real behaviour
- 3ReviewYou get explanations and better types
What we need from you
The TypeScript code and types pasted as text or screenshots, your tsconfig settings, the TypeScript version and the exact compiler errors.
We will ask you:
- Which TypeScript version and framework?
- Is strict mode turned on?
- Which compiler errors or type problems block you?
- Are you moving a JavaScript project to TypeScript?
Compare packages
| Packages | BasicCode up to 100 lines$15 | StandardCode up to 400 lines$35 | PremiumUp to 1,000 lines with a strictness plan$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 |
| Strictness plan | No | No | Yes |
| Order Basic | Order Standard | Order Premium |
Payment protection
You pay when you order, but the money is released only for accepted work.
- Fixed priceThe package price does not change after you pay.
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- Checked before deliveryEvery result goes through a quality check before it reaches you, and you see it on the order page before accepting it.
- Free revisionsAsk for changes within your brief as many times as the package allows.
- Acceptance after 3 daysIf within 3 days of delivery you neither accept the work nor ask for changes, it is accepted automatically. If you write in the order chat after delivery, the order waits; once we answer, we may start the 3 days again and will say so in the chat.
- Redo or a full refundIf the result does not match your brief and the revisions did not fix it, or the work takes more than twice its deadline, write in the order chat: we will redo the work or refund the payment in full.
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 just tell me how to silence the error?
We can, but we first show what the error is protecting you from, and offer a typed fix where one exists.
Do you help with migrating from JavaScript?
Yes. Paste the files you are converting and we suggest the types and the order to convert them in.