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mGalarnykmGalarnyk
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Updated car loan to have shorter variable names
1 parent 5db8951 commit 6edf45a

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2 files changed

+163
-185
lines changed

2 files changed

+163
-185
lines changed

‎Finance/.ipynb_checkpoints/car_loans-checkpoint.ipynb

Lines changed: 67 additions & 94 deletions
Original file line numberDiff line numberDiff line change
@@ -33,42 +33,29 @@
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{
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"cell_type": "code",
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"execution_count": 2,
36-
"metadata": {
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"collapsed": true
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},
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"outputs": [],
40-
"source": [
41-
"# California sales tax 7.5%\n",
42-
"P = 31115 * (1.075)\n",
43-
"\n",
44-
"r = 0.0702 / 12\n",
45-
"n = 60"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"metadata": {
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"collapsed": false
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},
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"outputs": [
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{
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"data": {
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"text/plain": [
58-
"662.638532377825"
43+
"662.64"
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]
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},
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"execution_count": 3,
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"execution_count": 2,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"P = 31115 * (1.075)\n",
53+
"r = 0.0702 / 12\n",
54+
"n = 60\n",
6755
"numerator = (r *((1 + r)**(n)) )\n",
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"denominator = ((1 + r)**(n)) - 1\n",
69-
"\n",
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"emi = P * (numerator / denominator)\n",
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"emi"
58+
"np.round(emi,2)"
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]
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},
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{
@@ -80,37 +67,35 @@
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},
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{
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"cell_type": "code",
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"execution_count": 4,
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"execution_count": 3,
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"metadata": {
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"collapsed": true
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"collapsed": false
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},
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"outputs": [],
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"outputs": [
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{
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"data": {
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"text/plain": [
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"687.23"
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]
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},
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"execution_count": 3,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"# Price + Tax + Emissions + Registration + Plate + Documentation\n",
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"P = 31115 + (32615 * 0.0975) + 50 + 200 + 65 + 80\n",
91-
"\n",
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"r = 0.0702 / 12\n",
93-
"n = 60"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 5,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"n = 60\n",
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"numerator = (r *((1 + r)**(n)) )\n",
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"denominator = ((1 + r)**(n)) - 1\n",
106-
"\n",
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"emi = P * (numerator / denominator)\n",
108-
"emi = np.round(emi, 2)"
93+
"np.round(emi,2)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 6,
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"execution_count": 4,
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"metadata": {
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"collapsed": false
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},
@@ -121,7 +106,7 @@
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"'The Monthly Payment with fees included is 24.59 higher'"
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]
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},
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"execution_count": 6,
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"execution_count": 4,
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"metadata": {},
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"output_type": "execute_result"
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}
@@ -155,7 +140,7 @@
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},
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{
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"cell_type": "code",
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"execution_count": 7,
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"execution_count": 5,
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"metadata": {
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"collapsed": false
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},
@@ -166,7 +151,7 @@
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"202.93628062500002"
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]
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},
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"execution_count": 7,
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"execution_count": 5,
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"metadata": {},
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"output_type": "execute_result"
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}
@@ -188,7 +173,7 @@
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},
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{
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"cell_type": "code",
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"execution_count": 8,
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"execution_count": 6,
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"metadata": {
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"collapsed": false
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},
@@ -199,7 +184,7 @@
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"34205.6725"
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]
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},
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"execution_count": 8,
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"execution_count": 6,
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"metadata": {},
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"output_type": "execute_result"
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}
@@ -217,7 +202,7 @@
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},
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{
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"cell_type": "code",
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"execution_count": 9,
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"execution_count": 7,
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"metadata": {
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"collapsed": false
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},
@@ -229,46 +214,34 @@
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"term = 60\n",
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"P = 34689.96\n",
231216
"\n",
232-
"def calc_interest(P, emi, interest_rate = 0.0702):\n",
233-
" \n",
234-
" # Assuming no fractional interst on a loan \n",
235-
" interest_paid = np.floor( ((interest_rate / 12) * P ) * 100) / 100\n",
236-
" \n",
237-
" principal_paid = np.round(emi - interest_paid, 2)\n",
238-
" \n",
217+
"def calc_interest(P,emi,interest_rate = 0.0702):\n",
218+
" interest_paid = np.floor(((interest_rate/12)*P)*100)/100\n",
219+
" principal_paid = np.round(emi-interest_paid, 2)\n",
239220
" new_balance = np.round(P - principal_paid,2)\n",
240-
" \n",
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" return(emi, interest_paid, principal_paid, new_balance)\n",
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"\n",
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"payment_list = []\n",
244-
"for month in range(1, term + 1):\n",
245-
"\n",
246-
" emi, interest_paid, principal_paid, new_balance = calc_interest(P, emi)\n",
247-
"\n",
248-
" payment_list.append([month, P, emi, interest_paid, principal_paid, new_balance])\n",
249-
"\n",
250-
" P = np.round(new_balance,2)"
224+
"for n in range(1, term + 1):\n",
225+
" emi,i_paid,p_paid,new_p = calc_interest(P, emi)\n",
226+
" payment_list.append([n, P, emi, i_paid, p_paid, new_p])\n",
227+
" P = np.round(new_p,2)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 10,
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"execution_count": 8,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"payment_table = pd.DataFrame(payment_list, columns = ['Month',\n",
262-
" 'Starting Balance',\n",
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" 'Repayment',\n",
264-
" 'Interest Paid',\n",
265-
" 'Principal Paid',\n",
266-
" 'New Balance'])"
238+
"c_names = ['Month','Starting Balance','Repayment','Interest Paid','Principal Paid','New Balance']\n",
239+
"payment_table = pd.DataFrame(payment_list, columns = c_names)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 11,
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"execution_count": 9,
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"metadata": {
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"collapsed": false
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},
@@ -307,7 +280,7 @@
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" <th>0</th>\n",
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" <td>1</td>\n",
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" <td>34689.96</td>\n",
310-
" <td>687.23</td>\n",
283+
" <td>687.230218</td>\n",
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" <td>202.93</td>\n",
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" <td>484.30</td>\n",
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" <td>34205.66</td>\n",
@@ -316,7 +289,7 @@
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" <th>1</th>\n",
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" <td>2</td>\n",
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" <td>34205.66</td>\n",
319-
" <td>687.23</td>\n",
292+
" <td>687.230218</td>\n",
320293
" <td>200.10</td>\n",
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" <td>487.13</td>\n",
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" <td>33718.53</td>\n",
@@ -325,7 +298,7 @@
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" <th>2</th>\n",
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" <td>3</td>\n",
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" <td>33718.53</td>\n",
328-
" <td>687.23</td>\n",
301+
" <td>687.230218</td>\n",
329302
" <td>197.25</td>\n",
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" <td>489.98</td>\n",
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" <td>33228.55</td>\n",
@@ -334,7 +307,7 @@
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" <th>3</th>\n",
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" <td>4</td>\n",
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" <td>33228.55</td>\n",
337-
" <td>687.23</td>\n",
310+
" <td>687.230218</td>\n",
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" <td>194.38</td>\n",
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" <td>492.85</td>\n",
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" <td>32735.70</td>\n",
@@ -343,7 +316,7 @@
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" <th>4</th>\n",
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" <td>5</td>\n",
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" <td>32735.70</td>\n",
346-
" <td>687.23</td>\n",
319+
" <td>687.230218</td>\n",
347320
" <td>191.50</td>\n",
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" <td>495.73</td>\n",
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" <td>32239.97</td>\n",
@@ -352,7 +325,7 @@
352325
" <th>5</th>\n",
353326
" <td>6</td>\n",
354327
" <td>32239.97</td>\n",
355-
" <td>687.23</td>\n",
328+
" <td>687.230218</td>\n",
356329
" <td>188.60</td>\n",
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" <td>498.63</td>\n",
358331
" <td>31741.34</td>\n",
@@ -361,7 +334,7 @@
361334
" <th>6</th>\n",
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" <td>7</td>\n",
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" <td>31741.34</td>\n",
364-
" <td>687.23</td>\n",
337+
" <td>687.230218</td>\n",
365338
" <td>185.68</td>\n",
366339
" <td>501.55</td>\n",
367340
" <td>31239.79</td>\n",
@@ -370,7 +343,7 @@
370343
" <th>7</th>\n",
371344
" <td>8</td>\n",
372345
" <td>31239.79</td>\n",
373-
" <td>687.23</td>\n",
346+
" <td>687.230218</td>\n",
374347
" <td>182.75</td>\n",
375348
" <td>504.48</td>\n",
376349
" <td>30735.31</td>\n",
@@ -379,7 +352,7 @@
379352
" <th>8</th>\n",
380353
" <td>9</td>\n",
381354
" <td>30735.31</td>\n",
382-
" <td>687.23</td>\n",
355+
" <td>687.230218</td>\n",
383356
" <td>179.80</td>\n",
384357
" <td>507.43</td>\n",
385358
" <td>30227.88</td>\n",
@@ -388,7 +361,7 @@
388361
" <th>9</th>\n",
389362
" <td>10</td>\n",
390363
" <td>30227.88</td>\n",
391-
" <td>687.23</td>\n",
364+
" <td>687.230218</td>\n",
392365
" <td>176.83</td>\n",
393366
" <td>510.40</td>\n",
394367
" <td>29717.48</td>\n",
@@ -398,17 +371,17 @@
398371
"</div>"
399372
],
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"text/plain": [
401-
" Month Starting Balance Repayment Interest Paid Principal Paid \\\n",
402-
"0 1 34689.96 687.23 202.93 484.30 \n",
403-
"1 2 34205.66 687.23 200.10 487.13 \n",
404-
"2 3 33718.53 687.23 197.25 489.98 \n",
405-
"3 4 33228.55 687.23 194.38 492.85 \n",
406-
"4 5 32735.70 687.23 191.50 495.73 \n",
407-
"5 6 32239.97 687.23 188.60 498.63 \n",
408-
"6 7 31741.34 687.23 185.68 501.55 \n",
409-
"7 8 31239.79 687.23 182.75 504.48 \n",
410-
"8 9 30735.31 687.23 179.80 507.43 \n",
411-
"9 10 30227.88 687.23 176.83 510.40 \n",
374+
" Month Starting Balance Repayment Interest Paid Principal Paid \\\n",
375+
"0 1 34689.96 687.230218 202.93 484.30 \n",
376+
"1 2 34205.66 687.230218 200.10 487.13 \n",
377+
"2 3 33718.53 687.230218 197.25 489.98 \n",
378+
"3 4 33228.55 687.230218 194.38 492.85 \n",
379+
"4 5 32735.70 687.230218 191.50 495.73 \n",
380+
"5 6 32239.97 687.230218 188.60 498.63 \n",
381+
"6 7 31741.34 687.230218 185.68 501.55 \n",
382+
"7 8 31239.79 687.230218 182.75 504.48 \n",
383+
"8 9 30735.31 687.230218 179.80 507.43 \n",
384+
"9 10 30227.88 687.230218 176.83 510.40 \n",
412385
"\n",
413386
" New Balance \n",
414387
"0 34205.66 \n",
@@ -423,7 +396,7 @@
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"9 29717.48 "
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]
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},
426-
"execution_count": 11,
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"execution_count": 9,
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"metadata": {},
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"output_type": "execute_result"
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}
@@ -470,7 +443,7 @@
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},
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{
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"cell_type": "code",
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"execution_count": 74,
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"execution_count": 13,
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"metadata": {
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"collapsed": false,
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"scrolled": true
@@ -537,7 +510,7 @@
537510
"P = 34689.96\n",
538511
"term = 60\n",
539512
"\n",
540-
"def generate_loan_table(P, term, interest_rate = 0.0702):\n",
513+
"def generate_loan_table(P, term, interest_rate=0.0702):\n",
541514
"\n",
542515
" def calc_emi(P, n, interest_rate):\n",
543516
" r = interest_rate / 12\n",
@@ -557,9 +530,9 @@
557530
" emi = calc_emi(P, term, interest_rate)\n",
558531
" payment_list = []\n",
559532
" \n",
560-
" for month in range(1, term + 1):\n",
561-
" emi, interest_paid, principal_paid, new_balance = calc_interest(P, emi, interest_rate)\n",
562-
" payment_list.append([month, P, emi, interest_paid, principal_paid, new_balance])\n",
533+
" for n in range(1, term + 1):\n",
534+
" emi,i_paid,p_paid, new_p = calc_interest(P, emi, interest_rate)\n",
535+
" payment_list.append([n, P, emi, i_paid, p_paid, new_p])\n",
563536
" P = np.round(new_balance,2)\n",
564537
" \n",
565538
" payment_table = pd.DataFrame(payment_list, columns = ['Month',\n",

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