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第一章01_base更新为notebook
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‎01_base/01.string.py‎

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‎01_base/01_字符串类型_str.ipynb‎

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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# 字符串"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## 介绍字符串的索引"
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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": 64,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"'g'"
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]
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},
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"execution_count": 64,
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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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"# 字符串的索引\n",
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"s = 'good morning'\n",
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"# 查看类型 \n",
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"print(type(s))\n",
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"s[0] # g"
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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": 65,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"'n'"
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]
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},
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"execution_count": 65,
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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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"s[-2] # n"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## 切分操作"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"\n",
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"\n",
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"分片用来从序列中提取出想要的子序列，其用法为：\n",
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"\n",
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"var[lower:upper:step]\n",
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"\n",
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"其范围包括 lower ，但不包括 upper ，即 [lower, upper)，\n",
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"step 表示取值间隔大小，如果没有默认为1。\n"
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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": 66,
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"metadata": {
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"pycharm": {
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"name": "#%%\n"
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}
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},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"'ing'"
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]
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},
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"execution_count": 66,
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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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"s[-3:] # ing"
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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": 67,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"'good morn'"
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]
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},
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"execution_count": 67,
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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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"s[:-3] # good morn"
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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": 68,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"'good morning'"
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]
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},
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"execution_count": 68,
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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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"s[:] # good morning"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"其他切分操作，练习：step"
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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": 69,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"go onn\n",
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"gninrom doog\n",
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"good morning\n"
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]
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}
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],
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"source": [
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"print(s[::2]) # go onn\n",
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"print(s[::-1]) # gninrom doog\n",
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"print(s[:100])"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"本节完。"
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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": null,
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"metadata": {},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.8.8"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 1
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}

‎01_base/02.list.py‎

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