Skip to content

Commit 5e2082e

Browse files
aadhikaraadhikar
committed
basics and beyond
1 parent 26e0796 commit 5e2082e

Some content is hidden

Large Commits have some content hidden by default. Use the searchbox below for content that may be hidden.

51 files changed

+9898
-0
lines changed

‎01 Introduction to Python/01_string_ops.ipynb

+272
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,272 @@
1+
{
2+
"cells": [
3+
{
4+
"cell_type": "code",
5+
"execution_count": 1,
6+
"metadata": {},
7+
"outputs": [
8+
{
9+
"name": "stdout",
10+
"output_type": "stream",
11+
"text": [
12+
"Hello world!\n",
13+
"Hello world!\n",
14+
"Hello world!\n",
15+
"12\n",
16+
"el\n",
17+
"False\n"
18+
]
19+
}
20+
],
21+
"source": [
22+
"'''\n",
23+
"Variables are used to store values. A string is a series of characters, surrounded by single or double quotes.\n",
24+
"'''\n",
25+
"\n",
26+
"# Hello world \n",
27+
"print('Hello world!')\n",
28+
"\n",
29+
"# Hello world with a variable \n",
30+
"greeting = 'Hello world!'\n",
31+
"print(greeting)\n",
32+
"print(greeting)\n",
33+
"print(len(greeting))\n",
34+
"print(greeting[1:3])\n",
35+
"print('t' in greeting)"
36+
]
37+
},
38+
{
39+
"cell_type": "code",
40+
"execution_count": 4,
41+
"metadata": {},
42+
"outputs": [
43+
{
44+
"name": "stdout",
45+
"output_type": "stream",
46+
"text": [
47+
" this string is not start with other because there are couple of old values needs to replaced by new ones but this string ends with other\n",
48+
" THIS STRING IS NOT START WITH OTHER BECAUSE THERE ARE COUPLE OF OLD VALUES NEEDS TO REPLACED BY NEW ONES BUT THIS STRING ENDS WITH OTHER\n",
49+
"This string is not start with other because there are couple of old values needs to replaced by new ones but this string ends with other\n",
50+
"False\n",
51+
"False\n",
52+
"False\n",
53+
"False\n",
54+
"True\n",
55+
"47\n",
56+
" This string is not start with other because there are couple of new values needs to replaced by new ones but this string ends with other\n",
57+
"['', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', 'This', 'string', 'is', 'not', 'start', 'with', 'other', 'because', 'there', 'are', 'couple', 'of', 'old', 'values', 'needs', 'to', 'replaced', 'by', 'new', 'ones', 'but', 'this', 'string', 'ends', 'with', 'other']\n",
58+
"l i s t\n"
59+
]
60+
}
61+
],
62+
"source": [
63+
"# String Methods\n",
64+
"string_methods = ' This string is not start with other because there are couple of old values needs to replaced by new ones but this string ends with other'\n",
65+
"print(string_methods.lower()) \t\t\t\t\t# returns the lowercase version of the string\n",
66+
"print(string_methods.upper()) \t\t\t\t\t# returns the uppercase version of the string\n",
67+
"print(string_methods.strip()) \t\t\t\t\t# returns a string with whitespace removed from the start and end\n",
68+
"print(string_methods.isalpha()) \t\t\t\t# tests if all the string chars are in the various character classes\n",
69+
"print(string_methods.isdigit()) \t\t\t\t# tests if all the string chars are in the various character classes\n",
70+
"print(string_methods.isspace()) \t\t\t\t# tests if all the string chars are in the various character classes\n",
71+
"print(string_methods.startswith('other')) \t\t# tests if the string starts with the given other string\n",
72+
"print(string_methods.endswith('other')) \t\t# tests if the string ends with the given other string\n",
73+
"print(string_methods.find('other')) \t\t\t# searches for the given other string (not a regular expression) within string_value, and returns the first index where it begins or -1 if not found\n",
74+
"print(string_methods.replace('old', 'new')) \t# returns a string where all occurrences of 'old' have been replaced by 'new'\n",
75+
"delim = ' ';\n",
76+
"print(string_methods.split(delim)) \t\t\t\t# returns a list of substrings separated by the given delimiter\n",
77+
"print(delim.join(['l', 'i', 's', 't'])) \t\t# opposite of split(), joins the elements in the given list together using the string as the delimiter"
78+
]
79+
},
80+
{
81+
"cell_type": "code",
82+
"execution_count": 14,
83+
"metadata": {},
84+
"outputs": [
85+
{
86+
"name": "stdout",
87+
"output_type": "stream",
88+
"text": [
89+
"First, thou shalt count to {0}\n",
90+
"Bring me a {}\n",
91+
"From {} to {}\n",
92+
"My name is Adhikari\n",
93+
"Weight in tons {0.weight}\n",
94+
"Units destroyed: {players[0]}\n",
95+
"a, b, c\n",
96+
"a, b, c\n",
97+
"c, b, a\n",
98+
"c, b, a\n",
99+
"abracadabra\n",
100+
"Welcome to Python\n",
101+
"My name is Annie and my age is 22\n"
102+
]
103+
}
104+
],
105+
"source": [
106+
"# String formating using % operator\n",
107+
"text = \"%d little pigs come out or I'll %s and %s and %s\" % (3, 'huff', 'puff', 'blow down');\n",
108+
"name = 'Adhikari'\n",
109+
"# String formating using Format String Syntax\n",
110+
"print(\"First, thou shalt count to {0}\") # References first positional argument\n",
111+
"print(\"Bring me a {}\") # Implicitly references the first positional argument\n",
112+
"print(\"From {} to {}\") # Same as \"From {0} to {1}\"\n",
113+
"print(f\"My name is {name}\") # References keyword argument 'name'\n",
114+
"print(\"Weight in tons {0.weight}\") # 'weight' attribute of first positional arg\n",
115+
"print(\"Units destroyed: {players[0]}\") # First element of keyword argument 'players'.\n",
116+
"print('{0}, {1}, {2}'.format('a', 'b', 'c'))\n",
117+
"print('{}, {}, {}'.format('a', 'b', 'c'))\n",
118+
"print('{2}, {1}, {0}'.format('a', 'b', 'c'))\n",
119+
"print('{2}, {1}, {0}'.format(*'abc'))\n",
120+
"print('{0}{1}{0}'.format('abra', 'cad')) # arguments' indices can be repeated\n",
121+
"print(\"Welcome to %s\"%(\"Python\"))\n",
122+
"print(\"My name is %s and my age is %d\"%(\"Annie\",22))"
123+
]
124+
},
125+
{
126+
"cell_type": "code",
127+
"execution_count": 36,
128+
"metadata": {},
129+
"outputs": [
130+
{
131+
"name": "stdout",
132+
"output_type": "stream",
133+
"text": [
134+
" this string is not start with other because there are couple of old values needs to replaced by new ones but this string ends with other\n",
135+
" THIS STRING IS NOT START WITH OTHER BECAUSE THERE ARE COUPLE OF OLD VALUES NEEDS TO REPLACED BY NEW ONES BUT THIS STRING ENDS WITH OTHER\n",
136+
"This string is not start with other because there are couple of old values needs to replaced by new ones but this string ends with other\n",
137+
"False\n",
138+
"False\n",
139+
"False\n",
140+
"False\n",
141+
"True\n",
142+
"33\n",
143+
" This string is not start with other because there are couple of new values needs to replaced by new ones but this string ends with other\n",
144+
"This string is not start with other because there are couple of old values needs to replaced by new ones but this string ends with other\n",
145+
"This string is not start with other because there are couple of old values needs to replaced by new ones but this string ends with other\n",
146+
"0\n",
147+
"b'This string is not start with other because there are couple of old values needs to replaced by new ones but this string ends with other'\n",
148+
"y\n",
149+
" \n",
150+
"This string is not start with oth--E--r because there are couple of old values needs to replaced by new ones but this string ends with other\n",
151+
"21\n",
152+
"['This', 'string', 'is', 'not', 'start', 'with', 'other', 'because', 'there', 'are', 'couple', 'of', 'old', 'values', 'needs', 'to', 'replaced', 'by', 'new', 'ones', 'but', 'this', 'string', 'ends', 'with', 'other']\n",
153+
"l i s t\n"
154+
]
155+
}
156+
],
157+
"source": [
158+
"# String Methods\n",
159+
"string_methods = ' This string is not start with other because there are couple of old values needs to replaced by new ones but this string ends with other'\n",
160+
"print(string_methods.lower()) \t\t\t\t\t# returns the lowercase version of the string\n",
161+
"print(string_methods.upper()) \t\t\t\t\t# returns the uppercase version of the string\n",
162+
"print(string_methods.strip()) \t\t\t\t\t# returns a string with whitespace removed from the start and end\n",
163+
"print(string_methods.isalpha()) \t\t\t\t# tests if all the string chars are in the various character classes\n",
164+
"print(string_methods.isdigit()) \t\t\t\t# tests if all the string chars are in the various character classes\n",
165+
"print(string_methods.isspace()) \t\t\t\t# tests if all the string chars are in the various character classes\n",
166+
"print(string_methods.startswith('other')) \t\t# tests if the string starts with the given other string\n",
167+
"print(string_methods.endswith('other')) \t\t# tests if the string ends with the given other string\n",
168+
"print(string_methods.find('other')) \t\t\t# searches for the given other string (not a regular expression) within string_value, and returns the first index where it begins or -1 if not found\n",
169+
"print(string_methods.replace('old', 'new')) \t# returns a string where all occurrences of 'old' have been replaced by 'new'\n",
170+
"\n",
171+
"string_methods = string_methods.strip()\n",
172+
"print(string_methods)\n",
173+
"print(string_methods.capitalize())\n",
174+
"print(string_methods.count(\"ka\", 0, len(string_methods))) # Count number of occurrences of a given substring using start and end\n",
175+
"\n",
176+
"encoded_string_methods = string_methods.encode('utf-8','strict')\n",
177+
"print(encoded_string_methods)\n",
178+
"\n",
179+
"print(max(string_methods))\n",
180+
"print(min(string_methods))\n",
181+
"print(string_methods.replace('e','--E--',1))\n",
182+
"print(string_methods.index('a')) #Return index if it finds orthewise throws error\n",
183+
"\n",
184+
"delim = ' ';\n",
185+
"print(string_methods.split(delim)) \t\t\t\t# returns a list of substrings separated by the given delimiter\n",
186+
"print(delim.join(['l', 'i', 's', 't'])) \t\t# opposite of split(), joins the elements in the given list together using the string as the delimiter"
187+
]
188+
},
189+
{
190+
"cell_type": "code",
191+
"execution_count": 47,
192+
"metadata": {},
193+
"outputs": [
194+
{
195+
"name": "stdout",
196+
"output_type": "stream",
197+
"text": [
198+
"Below line is to demonsrate character's position in string\n",
199+
" H e l l o\n",
200+
" 0 1 2 3 4\n",
201+
"-5 -4 -3 -2 -1\n",
202+
"02468\n",
203+
"gnirts ni noitisop s'retcarahc etarsnomed ot si enil woleB\n",
204+
"low line\n",
205+
"17\n"
206+
]
207+
}
208+
],
209+
"source": [
210+
"# String Slices\n",
211+
"string_slices = ' H e l l o';\n",
212+
"test_string = 'Below line is to demonsrate character\\'s position in string'\n",
213+
"print(test_string)\n",
214+
"print(string_slices)\n",
215+
"print(' 0 1 2 3 4') \t# range(0, 5)\n",
216+
"print('-5 -4 -3 -2 -1') \t# range(-5, 0)\n",
217+
"\n",
218+
"# Hint for slicing is s[start:end:step]\n",
219+
"print('0123456789'[::2]) # Every 2nd char in string\n",
220+
"print(test_string[::-1]) # Reverse the string\n",
221+
"print(test_string[2:10])\n",
222+
"print(test_string.find('d'))\n"
223+
]
224+
},
225+
{
226+
"cell_type": "code",
227+
"execution_count": 62,
228+
"metadata": {},
229+
"outputs": [
230+
{
231+
"name": "stdout",
232+
"output_type": "stream",
233+
"text": [
234+
"My full name is Albert Einstein\n",
235+
"I am Albert Einstein and I born in 1879\n"
236+
]
237+
}
238+
],
239+
"source": [
240+
"# Concatenation (combining strings) \n",
241+
"first_name = 'Albert'\n",
242+
"last_name = 'Einstein';\n",
243+
"year_of_birth = 1879\n",
244+
"full_name = 'My full name is ' + first_name + ' ' + last_name\n",
245+
"print(full_name)\n",
246+
"# print('I am ' + first_name + ' ' + last_name + ' and I born in ' + str(year_of_birth))\n",
247+
"print('I am {0} {1} and I born in {2}'.format(first_name, last_name, year_of_birth))"
248+
]
249+
}
250+
],
251+
"metadata": {
252+
"kernelspec": {
253+
"display_name": "Python 3",
254+
"language": "python",
255+
"name": "python3"
256+
},
257+
"language_info": {
258+
"codemirror_mode": {
259+
"name": "ipython",
260+
"version": 3
261+
},
262+
"file_extension": ".py",
263+
"mimetype": "text/x-python",
264+
"name": "python",
265+
"nbconvert_exporter": "python",
266+
"pygments_lexer": "ipython3",
267+
"version": "3.7.3"
268+
}
269+
},
270+
"nbformat": 4,
271+
"nbformat_minor": 2
272+
}

0 commit comments

Comments
 (0)