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| { | ||
| "cells": [ | ||
| { | ||
| "cell_type": "markdown", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "# Strings\n", | ||
| "\n", | ||
| "Some examples of strings methods" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": 63, | ||
| "metadata": {}, | ||
| "outputs": [ | ||
| { | ||
| "name": "stdout", | ||
| "output_type": "stream", | ||
| "text": [ | ||
| "['gattaca', 'MMBDTP', 'charles darwin at home', '122']\n" | ||
| ] | ||
| } | ||
| ], | ||
| "source": [ | ||
| "SomeStrings = [\"gattaca\", \"MMBDTP\", \"charles darwin at home\", \"122\"]\n", | ||
| "print(SomeStrings)" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "markdown", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "We can use a **loop** to print each element of the list:" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": 64, | ||
| "metadata": {}, | ||
| "outputs": [ | ||
| { | ||
| "name": "stdout", | ||
| "output_type": "stream", | ||
| "text": [ | ||
| "gattaca\n", | ||
| "MMBDTP\n", | ||
| "charles darwin at home\n", | ||
| "122\n" | ||
| ] | ||
| } | ||
| ], | ||
| "source": [ | ||
| "for string in SomeStrings:\n", | ||
| " print(string)" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "markdown", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "`len()` returns the length of the string:" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": 65, | ||
| "metadata": {}, | ||
| "outputs": [ | ||
| { | ||
| "name": "stdout", | ||
| "output_type": "stream", | ||
| "text": [ | ||
| "gattaca 7\n", | ||
| "MMBDTP 6\n", | ||
| "charles darwin at home 22\n", | ||
| "122 3\n" | ||
| ] | ||
| } | ||
| ], | ||
| "source": [ | ||
| "for string in SomeStrings:\n", | ||
| " print(string, len(string))" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "markdown", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "You can convert the string to **uppercase** or **lowercase** (this can be useful for example when searching motifs in a query sequence avoiding case sensitivity traps):" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": 66, | ||
| "metadata": {}, | ||
| "outputs": [ | ||
| { | ||
| "name": "stdout", | ||
| "output_type": "stream", | ||
| "text": [ | ||
| "gattaca -> GATTACA -> gattaca -> Gattaca\n", | ||
| "MMBDTP -> MMBDTP -> mmbdtp -> Mmbdtp\n", | ||
| "charles darwin at home -> CHARLES DARWIN AT HOME -> charles darwin at home -> Charles darwin at home\n", | ||
| "122 -> 122 -> 122 -> 122\n" | ||
| ] | ||
| } | ||
| ], | ||
| "source": [ | ||
| "for string in SomeStrings:\n", | ||
| " print(string, \" -> \", string.upper(),\" -> \", string.lower(),\" -> \", string.capitalize())" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "markdown", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "is the string a number?" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": 67, | ||
| "metadata": {}, | ||
| "outputs": [ | ||
| { | ||
| "name": "stdout", | ||
| "output_type": "stream", | ||
| "text": [ | ||
| "gattaca \n", | ||
| "\t is decimal? False \n", | ||
| "\t is digit? False \n", | ||
| "\t is numeric? False\n", | ||
| "MMBDTP \n", | ||
| "\t is decimal? False \n", | ||
| "\t is digit? False \n", | ||
| "\t is numeric? False\n", | ||
| "charles darwin at home \n", | ||
| "\t is decimal? False \n", | ||
| "\t is digit? False \n", | ||
| "\t is numeric? False\n", | ||
| "122 \n", | ||
| "\t is decimal? True \n", | ||
| "\t is digit? True \n", | ||
| "\t is numeric? True\n" | ||
| ] | ||
| } | ||
| ], | ||
| "source": [ | ||
| "for string in SomeStrings:\n", | ||
| " print(string, \"\\n\\t is decimal?\", string.isdecimal(),\"\\n\\t is digit?\", string.isdigit(), \"\\n\\t is numeric?\", string.isnumeric())" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "markdown", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "## Substrings?\n", | ||
| "\n", | ||
| "The `find()` method will return the (zero based) positio of a substring:" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": 68, | ||
| "metadata": {}, | ||
| "outputs": [ | ||
| { | ||
| "name": "stdout", | ||
| "output_type": "stream", | ||
| "text": [ | ||
| "'gattaca': Found at position 1\n", | ||
| "'MMBDTP': 'at' not found\n", | ||
| "'charles darwin at home': Found at position 15\n", | ||
| "'122': 'at' not found\n" | ||
| ] | ||
| } | ||
| ], | ||
| "source": [ | ||
| "for string in SomeStrings:\n", | ||
| " if string.find(\"at\") == -1:\n", | ||
| " print(f\"'{string}': 'at' not found\")\n", | ||
| " else:\n", | ||
| " print(f\"'{string}': Found at position {string.find('at')}\")" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "markdown", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "You can also **replace** strings" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": 70, | ||
| "metadata": {}, | ||
| "outputs": [ | ||
| { | ||
| "name": "stdout", | ||
| "output_type": "stream", | ||
| "text": [ | ||
| "The first string is gattaca\n", | ||
| "Replace 'a' with 'A' in the first string: gXttXcX\n" | ||
| ] | ||
| } | ||
| ], | ||
| "source": [ | ||
| "print(\"The first string is\", SomeStrings[0])\n", | ||
| "print(\"Replace 'a' with 'A' in the first string:\", SomeStrings[0].replace(\"a\", \"X\"))" | ||
| ] | ||
| } | ||
| ], | ||
| "metadata": { | ||
| "kernelspec": { | ||
| "display_name": "pystart", | ||
| "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": "3.10.14" | ||
| } | ||
| }, | ||
| "nbformat": 4, | ||
| "nbformat_minor": 2 | ||
| } |