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solved #116

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martacarballo Nov 15, 2025
0708fa6
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martacarballo Nov 15, 2025
7520913
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martacarballo Nov 15, 2025
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132 changes: 112 additions & 20 deletions lab-python-lambda-map-reduce-filter.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -94,12 +94,25 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 6,
"id": "0781335d-39cf-403d-b86a-ca908a09fe55",
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[(-1200, 'debit'), (-100, 'debit'), (-250, 'debit'), (-300, 'debit'), (-850, 'debit')]\n"
]
}
],
"source": [
"# your code goes here"
"# Create a new list called debits that includes all of the debit transactions from the list transactions.\n",
"# Use the filter() function to create a new list called debits\n",
"transactions = [(-1200, 'debit'), (2500, 'credit'), (-100, 'debit'), (850, 'credit'), (-250, 'debit'), (1500, 'credit'), (-300, 'debit'), (5000, 'credit'), (-850, 'debit'), (1000, 'credit')]\n",
"debits = list(filter(lambda x: x[1] == 'debit', transactions)) \n",
"print(debits)\n",
"\n"
]
},
{
Expand All @@ -124,12 +137,29 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 8,
"id": "25073469-7258-4fc6-b0a0-ef8ea57688fe",
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[(-100, 'debit'), (-250, 'debit'), (-300, 'debit'), (-850, 'debit'), (-1200, 'debit')]\n"
]
}
],
"source": [
"# your code goes here"
"# Use the previously created debits list.\n",
"# Define a lambda function called sort_descending that takes two tuples and returns True \n",
"# if the transaction amount of the first tuple is greater than the transaction amount of the second tuple.\n",
"# Use the sorted() function with sort_descending and debits to create a new list.\n",
"\n",
"transactions = [(-1200, 'debit'), (2500, 'credit'), (-100, 'debit'), (850, 'credit'), (-250, 'debit'), (1500, 'credit'), (-300, 'debit'), (5000, 'credit'), (-850, 'debit'), (1000, 'credit')]\n",
"debits = list(filter(lambda x: x[1] == 'debit', transactions))\n",
"sort_descending = lambda x: x[0]\n",
"sorted_debits = sorted(debits, key=sort_descending, reverse=True)\n",
"print(sorted_debits)"
]
},
{
Expand Down Expand Up @@ -169,12 +199,26 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 9,
"id": "2f253b7e-5300-4819-b38f-9fc090554f51",
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[105.0, 52.5, -26.25, 1050.0, -10.5]\n"
]
}
],
"source": [
"# your code goes here"
"# Write Python code to take a list of bank account balances, \n",
"# and returns a new list containing the balance after one year of interest has been added.\n",
"# Use the map function to apply this function to the list of bank accounts, and take an interest rate of 0.05.\n",
"balances = [100, 50, -25, 1000, -10]\n",
"interest_rate = 0.05\n",
"updated_balances = list(map(lambda x: x * (1 + interest_rate), balances))\n",
"print(updated_balances)"
]
},
{
Expand Down Expand Up @@ -209,12 +253,29 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 11,
"id": "0906a9b0-d567-4786-96f2-5755611b885e",
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[{'balance': 1020.0, 'interest_rate': 0.02}, {'balance': 2020.0, 'interest_rate': 0.01}, {'balance': 515.0, 'interest_rate': 0.03}]\n"
]
}
],
"source": [
"# your code goes here\n"
"# Write Python code to take a list of bank account dictionaries, each containing the account balance and interest rate,\n",
"# and returns a new list of dictionaries containing the balance after one year of interest has been added. \n",
"# Use the map function to apply this function to the list of bank accounts.\n",
"accounts = [\n",
" {'balance': 1000, 'interest_rate': 0.02},\n",
" {'balance': 2000, 'interest_rate': 0.01},\n",
" {'balance': 500, 'interest_rate': 0.03},\n",
"]\n",
"updated_accounts = list(map(lambda account: {'balance': account['balance'] * (1 + account['interest_rate']), 'interest_rate': account['interest_rate']}, accounts))\n",
"print(updated_accounts)"
]
},
{
Expand Down Expand Up @@ -243,14 +304,28 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 13,
"id": "6284dbd3-e117-411e-8087-352be6deaed4",
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"-36.75\n"
]
}
],
"source": [
"from functools import reduce\n",
"\n",
"# your code goes here"
"# Write Python code to take the new list of bank account balances (balances list after applying an interest_rate of 0.05, \n",
"# result of Challenge 1 Exercise 1),\n",
"# and print the total amount of negative balances. Use filter and reduce function.\n",
"updated_accounts = [105.0, 52.5, -26.25, 1050.0, -10.5]\n",
"negative_balances = list(filter(lambda x: x < 0, updated_accounts))\n",
"total_negative_balance = reduce(lambda x, y: x + y, negative_balances)\n",
"print(total_negative_balance)\n"
]
},
{
Expand All @@ -273,24 +348,41 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 14,
"id": "da2264b5-298e-4b45-99df-852b94e90d15",
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[650, 1600, 275]\n"
]
}
],
"source": [
"accounts = [\n",
" {'balance': 1000, 'withdrawals': [100, 50, 200]},\n",
" {'balance': 2000, 'withdrawals': [300, 100]},\n",
" {'balance': 500, 'withdrawals': [50, 100, 75]},\n",
"]\n",
"\n",
"# your code goes here\n"
"# Write a Python function called calculate_balance that takes a bank account dictionary as an \n",
"# argument and returns the remaining balance after subtracting all the withdrawals.\n",
"#Then, use the map function and the calculate_balance function to apply it to the list accounts. \n",
"# This should give you a list of remaining balances after all the withdrawals have been subtracted.\n",
"\n",
"def calculate_balance(account):\n",
" return account['balance'] - sum(account['withdrawals'])\n",
"\n",
"remaining_balances = list(map(calculate_balance, accounts))\n",
"print(remaining_balances) "
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3 (ipykernel)",
"display_name": "Python 3",
"language": "python",
"name": "python3"
},
Expand All @@ -304,7 +396,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.9.13"
"version": "3.12.9"
}
},
"nbformat": 4,
Expand Down