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.ipynb
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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Exercise 1: Basic Python 1\n",
"Modified from exercises provided with Programming with Python for Social Science by Phillip Brooker and from Social Data Science 2019 by Andreas Bjerre-Nielson\n",
"\n",
"## 1.1 DATA TYPES\n",
"**QUESTION 1.1.1**"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"#an integer is a \"whole number\" (i.e. one with no decimal point)\n",
"my_integer = 14\n",
"\n",
"#a float is a numerical value with a decimal point\n",
"my_float = 11.1\n",
"\n",
"#a string is text\n",
"my_string = \"This is my string.\"\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"What type of variables do you think the following five are? "
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"var1 = \"0.1\"\n",
"\n",
"var2 = 5 - 9\n",
"\n",
"var3 = 10 + 10.1\n",
"\n",
"var4 = \"10 + 10.1\"\n",
"\n",
"var5 = 10.1 - 0.1"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"#Answer to Question 1.1.1\n",
"#var1 = string\n",
"#var2 = integer\n",
"#var3 = my_integer and my_float\n",
"#var4 = string\n",
"#var5 = my_float - my_float"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 1.2 Basic Operations"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Question 1.2.1**: Variables can be reassigned and overwritten."
]
},
{
"cell_type": "code",
"execution_count": 14,
"metadata": {},
"outputs": [],
"source": [
"original_var = 20\n",
"new_var = original_var + 10\n",
"\n",
"original_var2 = 5\n",
"original_var2 = original_var2 + 5"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Can you guess the values for new_var and original_var2?\n"
]
},
{
"cell_type": "code",
"execution_count": 21,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"First is true\n",
"Second is true\n"
]
}
],
"source": [
"#Answer to Question 1.2.1\n",
"original_var = 20\n",
"new_var=original_var+10\n",
"\n",
"original_var2=5\n",
"original_var2=original_var2+5\n",
"\n",
"if new_var is 30:\n",
" print(\"First is true\")\n",
"else:\n",
" print(\"First is false\")\n",
" \n",
"if original_var2 is 10:\n",
" print(\"Second is true\")\n",
"else:\n",
" print(\"Second is false\")"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Question 1.2.2**: Can you guess what string1 will contain?"
]
},
{
"cell_type": "code",
"execution_count": 23,
"metadata": {},
"outputs": [],
"source": [
"string1 = \"This is the first part of the string.\"\n",
"string1 = string1 + \" This is the second part of the string.\""
]
},
{
"cell_type": "code",
"execution_count": 24,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"This is the first part of the string. This is the second part of the string.\n"
]
}
],
"source": [
"#Answer to Question 1.2.2\n",
"print(string1)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Question 1.2.3**: Try adding these two variables together, and explain what happens."
]
},
{
"cell_type": "code",
"execution_count": 41,
"metadata": {},
"outputs": [
{
"ename": "TypeError",
"evalue": "unsupported operand type(s) for +: 'int' and 'str'",
"output_type": "error",
"traceback": [
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[0;31mTypeError\u001b[0m Traceback (most recent call last)",
"\u001b[0;32m<ipython-input-41-aed29ac34edd>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m 3\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 4\u001b[0m \u001b[0;31m#int(first_bit)+int(second_bit)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 5\u001b[0;31m \u001b[0;36m14\u001b[0m\u001b[0;34m+\u001b[0m\u001b[0;34m\"14\"\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[0;31mTypeError\u001b[0m: unsupported operand type(s) for +: 'int' and 'str'"
]
}
],
"source": [
"first_bit = 14\n",
"second_bit = \"14\"\n",
"\n",
"#int(first_bit)+int(second_bit)\n",
"14+\"14\""
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"# Answer to Question 1.2.3\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Question 1.2.4**\n",
"\n",
"We can also convert variable types to different variable types, as follows:\n",
"\n",
"To 'stringify' something, we can use str(VARIABLE). Below, I'll declare a variable which is an integer, then I'll use str(VARIABLE) to write the 'stringified' version to a new variable."
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"my_integer_variable = 30\n",
"my_stringified_variable = str(my_integer_variable)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"To 'integerify' something, we can use int(VARIABLE). Below, I'll declare a\n",
"variable which is a number written out as a string, then I'll use\n",
"int(VARIABLE) to write the 'integerified' version to a new variable."
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"my_string_variable = \"30\"\n",
"my_integerified_variable = int(my_string_variable)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"To 'floatify' an integer, we can use float(VARIABLE). Below, declare an\n",
"integer variable, then use float(VARIABLE) to write the 'floatified'\n",
"version to a new variable: "
]
},
{
"cell_type": "code",
"execution_count": 48,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"30.0\n"
]
}
],
"source": [
"# Answer to Question 1.2.4\n",
"my_int_var=30\n",
"my_float_var=float(my_int_var)\n",
"print(my_float_var)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Question 1.2.5**: Division in Python has two ways of usage. What is the output of `5/2`? What is the output of `5//2`? What is the fundamental data type for each of the two operations? Explain your results."
]
},
{
"cell_type": "code",
"execution_count": 50,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"2.5\n",
"2\n"
]
}
],
"source": [
"# Answer to Question 1.2.5\n",
"print(5/2)\n",
"print(5//2)\n",
"#// gør tallet til integer på samme måde som int(5/2)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Question 1.2.6**: What is the output of `5%2` and `5**2`? Explain your answers."
]
},
{
"cell_type": "code",
"execution_count": 52,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"1\n",
"25\n",
"3125\n"
]
}
],
"source": [
"# Answer to Question 1.2.6\n",
"print(5%2)\n",
"print(5**2)\n",
"#procent\n",
"#potens"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Question 1.2.7**: Use expressions <, >, ==, != to compare 4 to 6 (e.g. run 4<6). What are the input data types? What are the output data types?"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"# Answer to Question 1.2.7"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 1.3 String Operations"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Strings have multiple operations and functions associated. In this exercise we investigate a few of these. \n",
"\n",
"**Question 1.3.1**: Create variables s1='Chameleon' and s2='ham'. Check whether the string s2 is a substring of s1. \n",
"\n",
"*Hint: One string operation is to check whether a string S contains a substring T, this can be done with the in \n",
"operator: S in T.*"
]
},
{
"cell_type": "code",
"execution_count": 53,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"True"
]
},
"execution_count": 53,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"# Answer to Question 1.3.1 \n",
"\n",
"s1=\"Chameleon\"\n",
"s2=\"ham\"\n",
"s2 in s1"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Question 1.3.2**: Make a variable s3 that is the same as s1 but all upper case, then check again whether s2 is a substring of of s3. Explain your answer. \n",
"\n",
"*Hint: Remember that strings have methods like upper(), lower(), and capitalize()* "
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {},
"outputs": [],
"source": [
"# Answer to Question 1.3.2"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 1.4 Control logic (if statements)\n",
"\n",
"**Question 1.4.1**: Imagine that we have a car that can fit 5 passengers, and we want to know, if the car can fit more passengers. Using 'if' and 'else', make a piece of code that prints out \"The car is full\" if passengers (taken as input) is 5 or more, and \"The car is not full yet\" if passengers are less than 5.\n",
"\n",
"Note: Multiple conditions can be inserted with elif statement(s):"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"#Read how many passengers are in the car\n",
"passengers = input (\"How many passengers are in the car? \")\n",
"\n",
"#Answer to Question 1.4.1\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Question 1.4.2**: Create a program which produces statements about numbers that you give it, with the following conditions:\n",
"- if the number is over 100 print \"Phew, that's a big number.\"\n",
"- if the number is even, print \"This one is even.\"\n",
"- if the number is even and over 100 print \"Stop. I can't even.\"\n",
"- if the number doesn't satisfy any of these conditions, print the number."
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {},
"outputs": [],
"source": [
"#Answer to Question 1.4.2\n",
"\n",
"#Check the program with a few values to see if it gives the results you expect."
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Question 1.4.3**: Choose an everyday activity (like making tea). Write a script workflow for that activity."
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"*Answer to Question 1.4.3. here. \n",
"Note that this cell is in Markdown mode rather than Code mode, so you can write your answer as text.* "
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 1.5 Reflection\n",
"**Question 1.5.1**: Write a brief paragraph reflecting on your experience learning basic programming operations and logic structures. What did you struggle with? What did you enjoy? What surprised you?\n",
" *Note: We will ask you in the assignments to submit a summary of your reflections*"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"*Answer to Question 1.5.1*"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3",
"language": "python",
"name": "python3"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 3
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.7.4"
}
},
"nbformat": 4,
"nbformat_minor": 2
}