# Build a Medical Data Validator - Step 44

**URL:** <https://forum.freecodecamp.org/t/build-a-medical-data-validator-step-44/775662>\
**Category:** Curriculum Help\
**Tags:** python\
**Created:** [January 27, 2026, 8:55am UTC](https://forum.freecodecamp.org/t/build-a-medical-data-validator-step-44/775662 "2026-01-27T08:55:46Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Programmer4](https://avatars.discourse-cdn.com/v4/letter/p/e56c9b/32.png) [@Programmer4](https://forum.freecodecamp.org/u/Programmer4)\
**Post date:** [January 27, 2026, 8:55am UTC](https://forum.freecodecamp.org/t/build-a-medical-data-validator-step-44/775662/1 "2026-01-27T08:55:46Z")

</div>

### Tell us what’s happening:

i have created a for loop but it says i have to create a for loop for the invalid records

### Your code so far

```py
import re

medical_records = [
    {
        'patient_id': 'P1001',
        'age': 34,
        'gender': 'Female',
        'diagnosis': 'Hypertension',
        'medications': ['Lisinopril'],
        'last_visit_id': 'V2301',
    },
    {
        'patient_id': 'p1002',
        'age': 47,
        'gender': 'male',
        'diagnosis': 'Type 2 Diabetes',
        'medications': ['Metformin', 'Insulin'],
        'last_visit_id': 'v2302',
    },
    {
        'patient_id': 'P1003',
        'age': 29,
        'gender': 'female',
        'diagnosis': 'Asthma',
        'medications': ['Albuterol'],
        'last_visit_id': 'v2303',
    },
    {
        'patient_id': 'p1004',
        'age': 56,
        'gender': 'Male',
        'diagnosis': 'Chronic Back Pain',
        'medications': ['Ibuprofen', 'Physical Therapy'],
        'last_visit_id': 'V2304',
    }
]

def find_invalid_records(
    patient_id, age, gender, diagnosis, medications, last_visit_id
):

    constraints = {
        'patient_id': isinstance(patient_id, str)
        and re.fullmatch('p\d+', patient_id, re.IGNORECASE),
        'age': isinstance(age, int) and age >= 18,
        'gender': isinstance(gender, str) and gender.lower() in ('male', 'female'),
        'diagnosis': isinstance(diagnosis, str) or diagnosis is None,
        'medications': isinstance(medications, list)
        and all([isinstance(i, str) for i in medications]),
        'last_visit_id': isinstance(last_visit_id, str)
        and re.fullmatch('v\d+', last_visit_id, re.IGNORECASE)
    }

    return [key for key, value in constraints.items() if not value]

def validate(data):
    is_sequence = isinstance(data, (list, tuple))

    if not is_sequence:
        print('Invalid format: expected a list or tuple.')
        return False
        
    is_invalid = False
    key_set = set(
        ['patient_id', 'age', 'gender', 'diagnosis', 'medications', 'last_visit_id']
    )

    for index, dictionary in enumerate(data):
        if not isinstance(dictionary, dict):
            print(f'Invalid format: expected a dictionary at position {index}.')
            is_invalid = True
            continue

        if set(dictionary.keys()) != key_set:
            print(
                f'Invalid format: {dictionary} at position {index} has missing and/or invalid keys.'
            )
            is_invalid = True
            continue

        invalid_records = find_invalid_records(**dictionary)
        print(type(invalid_records))

# User Editable Region

        for index, (key, val) in enumerate(invalid_records):
            print(f'Unexpected format {key}:{val} at position{index}.')
            is_invalid = True

# User Editable Region

    if is_invalid:
        return False
    print('Valid format.')
    return True

validate(medical_records)

```

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### Challenge Information:

Build a Medical Data Validator - Step 44

> **[freeCodeCamp.org](https://www.freecodecamp.org/learn/python-v9/workshop-medical-data-validator/step-44)**
>
> Learn to Code — For Free

---

<div class="post-metadata">

**Author:** ![ILM](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/ilm/32/363239_2.png) [@ILM](https://forum.freecodecamp.org/u/ILM)\
**Post date:** [January 27, 2026, 9:23am UTC](https://forum.freecodecamp.org/t/build-a-medical-data-validator-step-44/775662/2 "2026-01-27T09:23:06Z")

</div>

you are assuming what’s inside `invalid_records`, instead review how it is created and/or make something invalid in the global object and `print` `invalid_records` to see what’s in it

---

<div class="post-metadata">

**Author:** ![Programmer4](https://avatars.discourse-cdn.com/v4/letter/p/e56c9b/32.png) [@Programmer4](https://forum.freecodecamp.org/u/Programmer4)\
**Post date:** [January 28, 2026, 8:05am UTC](https://forum.freecodecamp.org/t/build-a-medical-data-validator-step-44/775662/3 "2026-01-28T08:05:45Z")

</div>

when i print invalid\_records it shows that its a list.

---

<div class="post-metadata">

**Author:** ![ILM](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/ilm/32/363239_2.png) [@ILM](https://forum.freecodecamp.org/u/ILM)\
**Post date:** [January 28, 2026, 8:22am UTC](https://forum.freecodecamp.org/t/build-a-medical-data-validator-step-44/775662/4 "2026-01-28T08:22:11Z")

</div>

and what’s inside the list? does the `(key, value)` match what’s inside the list?

---

<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/freecodecamp/original/3X/e/1/e1c433102e34b46dfaa3e15d13ab9a514b127078.svg) [@system](https://forum.freecodecamp.org/u/system)\
**Post date:** [February 25, 2026, 8:23am UTC](https://forum.freecodecamp.org/t/build-a-medical-data-validator-step-44/775662/5 "2026-02-25T08:23:02Z")

</div>

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