0005 str.startswith, str.endswith.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s = 'abcde'\n",
    "\n",
    "s[0] == 'a'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.find('ab') == 0"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.index('ab') == 0"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.startswith('ab')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.startswith('a')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.startswith('abc')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.startswith('')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'abcde'"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.endswith('e')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.endswith('de')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s[0] == 'a'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 12,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s[-1] == 'e'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on method_descriptor:\n",
      "\n",
      "startswith(...)\n",
      "    S.startswith(prefix[, start[, end]]) -> bool\n",
      "    \n",
      "    Return True if S starts with the specified prefix, False otherwise.\n",
      "    With optional start, test S beginning at that position.\n",
      "    With optional end, stop comparing S at that position.\n",
      "    prefix can also be a tuple of strings to try.\n",
      "\n"
     ]
    }
   ],
   "source": [
    "help(str.startswith)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'abcde'"
      ]
     },
     "execution_count": 14,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 15,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.startswith(('a', 'y'))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 16,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.endswith(('x', 'y', 'z', 'e'))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "nobody:*:-2:-2:Unprivileged User:/var/empty:/usr/bin/false\n",
      "root:*:0:0:System Administrator:/var/root:/bin/sh\n",
      "daemon:*:1:1:System Services:/var/root:/usr/bin/false\n",
      "_uucp:*:4:4:Unix to Unix Copy Protocol:/var/spool/uucp:/usr/sbin/uucico\n",
      "_taskgated:*:13:13:Task Gate Daemon:/var/empty:/usr/bin/false\n",
      "_networkd:*:24:24:Network Services:/var/networkd:/usr/bin/false\n",
      "_installassistant:*:25:25:Install Assistant:/var/empty:/usr/bin/false\n",
      "_lp:*:26:26:Printing Services:/var/spool/cups:/usr/bin/false\n",
      "_postfix:*:27:27:Postfix Mail Server:/var/spool/postfix:/usr/bin/false\n",
      "_scsd:*:31:31:Service Configuration Service:/var/empty:/usr/bin/false\n",
      "_ces:*:32:32:Certificate Enrollment Service:/var/empty:/usr/bin/false\n",
      "_appstore:*:33:33:Mac App Store Service:/var/empty:/usr/bin/false\n",
      "_mcxalr:*:54:54:MCX AppLaunch:/var/empty:/usr/bin/false\n",
      "_appleevents:*:55:55:AppleEvents Daemon:/var/empty:/usr/bin/false\n",
      "_geod:*:56:56:Geo Services Daemon:/var/db/geod:/usr/bin/false\n",
      "_devdocs:*:59:59:Developer Documentation:/var/empty:/usr/bin/false\n",
      "_sandbox:*:60:60:Seatbelt:/var/empty:/usr/bin/false\n",
      "_mdnsresponder:*:65:65:mDNSResponder:/var/empty:/usr/bin/false\n",
      "_ard:*:67:67:Apple Remote Desktop:/var/empty:/usr/bin/false\n",
      "_www:*:70:70:World Wide Web Server:/Library/WebServer:/usr/bin/false\n",
      "_eppc:*:71:71:Apple Events User:/var/empty:/usr/bin/false\n",
      "_cvs:*:72:72:CVS Server:/var/empty:/usr/bin/false\n",
      "_svn:*:73:73:SVN Server:/var/empty:/usr/bin/false\n",
      "_mysql:*:74:74:MySQL Server:/var/empty:/usr/bin/false\n",
      "_sshd:*:75:75:sshd Privilege separation:/var/empty:/usr/bin/false\n",
      "_qtss:*:76:76:QuickTime Streaming Server:/var/empty:/usr/bin/false\n",
      "_cyrus:*:77:6:Cyrus Administrator:/var/imap:/usr/bin/false\n",
      "_mailman:*:78:78:Mailman List Server:/var/empty:/usr/bin/false\n",
      "_appserver:*:79:79:Application Server:/var/empty:/usr/bin/false\n",
      "_clamav:*:82:82:ClamAV Daemon:/var/virusmails:/usr/bin/false\n",
      "_amavisd:*:83:83:AMaViS Daemon:/var/virusmails:/usr/bin/false\n",
      "_jabber:*:84:84:Jabber XMPP Server:/var/empty:/usr/bin/false\n",
      "_appowner:*:87:87:Application Owner:/var/empty:/usr/bin/false\n",
      "_windowserver:*:88:88:WindowServer:/var/empty:/usr/bin/false\n",
      "_spotlight:*:89:89:Spotlight:/var/empty:/usr/bin/false\n",
      "_tokend:*:91:91:Token Daemon:/var/empty:/usr/bin/false\n",
      "_securityagent:*:92:92:SecurityAgent:/var/db/securityagent:/usr/bin/false\n",
      "_calendar:*:93:93:Calendar:/var/empty:/usr/bin/false\n",
      "_teamsserver:*:94:94:TeamsServer:/var/teamsserver:/usr/bin/false\n",
      "_update_sharing:*:95:-2:Update Sharing:/var/empty:/usr/bin/false\n",
      "_installer:*:96:-2:Installer:/var/empty:/usr/bin/false\n",
      "_atsserver:*:97:97:ATS Server:/var/empty:/usr/bin/false\n",
      "_ftp:*:98:-2:FTP Daemon:/var/empty:/usr/bin/false\n",
      "_unknown:*:99:99:Unknown User:/var/empty:/usr/bin/false\n",
      "_softwareupdate:*:200:200:Software Update Service:/var/db/softwareupdate:/usr/bin/false\n",
      "_coreaudiod:*:202:202:Core Audio Daemon:/var/empty:/usr/bin/false\n",
      "_screensaver:*:203:203:Screensaver:/var/empty:/usr/bin/false\n",
      "_locationd:*:205:205:Location Daemon:/var/db/locationd:/usr/bin/false\n",
      "_trustevaluationagent:*:208:208:Trust Evaluation Agent:/var/empty:/usr/bin/false\n",
      "_timezone:*:210:210:AutoTimeZoneDaemon:/var/empty:/usr/bin/false\n",
      "_lda:*:211:211:Local Delivery Agent:/var/empty:/usr/bin/false\n",
      "_cvmsroot:*:212:212:CVMS Root:/var/empty:/usr/bin/false\n",
      "_usbmuxd:*:213:213:iPhone OS Device Helper:/var/db/lockdown:/usr/bin/false\n",
      "_dovecot:*:214:6:Dovecot Administrator:/var/empty:/usr/bin/false\n",
      "_dpaudio:*:215:215:DP Audio:/var/empty:/usr/bin/false\n",
      "_postgres:*:216:216:PostgreSQL Server:/var/empty:/usr/bin/false\n",
      "_krbtgt:*:217:-2:Kerberos Ticket Granting Ticket:/var/empty:/usr/bin/false\n",
      "_kadmin_admin:*:218:-2:Kerberos Admin Service:/var/empty:/usr/bin/false\n",
      "_kadmin_changepw:*:219:-2:Kerberos Change Password Service:/var/empty:/usr/bin/false\n",
      "_devicemgr:*:220:220:Device Management Server:/var/empty:/usr/bin/false\n",
      "_webauthserver:*:221:221:Web Auth Server:/var/empty:/usr/bin/false\n",
      "_netbios:*:222:222:NetBIOS:/var/empty:/usr/bin/false\n",
      "_warmd:*:224:224:Warm Daemon:/var/empty:/usr/bin/false\n",
      "_dovenull:*:227:227:Dovecot Authentication:/var/empty:/usr/bin/false\n",
      "_netstatistics:*:228:228:Network Statistics Daemon:/var/empty:/usr/bin/false\n",
      "_avbdeviced:*:229:-2:Ethernet AVB Device Daemon:/var/empty:/usr/bin/false\n",
      "_krb_krbtgt:*:230:-2:Open Directory Kerberos Ticket Granting Ticket:/var/empty:/usr/bin/false\n",
      "_krb_kadmin:*:231:-2:Open Directory Kerberos Admin Service:/var/empty:/usr/bin/false\n",
      "_krb_changepw:*:232:-2:Open Directory Kerberos Change Password Service:/var/empty:/usr/bin/false\n",
      "_krb_kerberos:*:233:-2:Open Directory Kerberos:/var/empty:/usr/bin/false\n",
      "_krb_anonymous:*:234:-2:Open Directory Kerberos Anonymous:/var/empty:/usr/bin/false\n",
      "_assetcache:*:235:235:Asset Cache Service:/var/empty:/usr/bin/false\n",
      "_coremediaiod:*:236:236:Core Media IO Daemon:/var/empty:/usr/bin/false\n",
      "_launchservicesd:*:239:239:_launchservicesd:/var/empty:/usr/bin/false\n",
      "_iconservices:*:240:240:IconServices:/var/empty:/usr/bin/false\n",
      "_distnote:*:241:241:DistNote:/var/empty:/usr/bin/false\n",
      "_nsurlsessiond:*:242:242:NSURLSession Daemon:/var/db/nsurlsessiond:/usr/bin/false\n",
      "_nsurlstoraged:*:243:243:NSURLStorage Daemon:/var/db/nsurlstoraged:/usr/bin/false\n",
      "_displaypolicyd:*:244:244:Display Policy Daemon:/var/empty:/usr/bin/false\n",
      "_astris:*:245:245:Astris Services:/var/db/astris:/usr/bin/false\n",
      "_krbfast:*:246:-2:Kerberos FAST Account:/var/empty:/usr/bin/false\n",
      "_gamecontrollerd:*:247:247:Game Controller Daemon:/var/empty:/usr/bin/false\n",
      "_mbsetupuser:*:248:248:Setup User:/var/setup:/bin/bash\n",
      "_ondemand:*:249:249:On Demand Resource Daemon:/var/db/ondemand:/usr/bin/false\n",
      "_xserverdocs:*:251:251:macOS Server Documents Service:/var/empty:/usr/bin/false\n",
      "_wwwproxy:*:252:252:WWW Proxy:/var/empty:/usr/bin/false\n",
      "_mobileasset:*:253:253:MobileAsset User:/var/ma:/usr/bin/false\n",
      "_findmydevice:*:254:254:Find My Device Daemon:/var/db/findmydevice:/usr/bin/false\n",
      "_datadetectors:*:257:257:DataDetectors:/var/db/datadetectors:/usr/bin/false\n",
      "_captiveagent:*:258:258:captiveagent:/var/empty:/usr/bin/false\n",
      "_ctkd:*:259:259:ctkd Account:/var/empty:/usr/bin/false\n",
      "_applepay:*:260:260:applepay Account:/var/db/applepay:/usr/bin/false\n",
      "_hidd:*:261:261:HID Service User:/var/db/hidd:/usr/bin/false\n",
      "_cmiodalassistants:*:262:262:CoreMedia IO Assistants User:/var/db/cmiodalassistants:/usr/bin/false\n",
      "_analyticsd:*:263:263:Analytics Daemon:/var/db/analyticsd:/usr/bin/false\n",
      "_fpsd:*:265:265:FPS Daemon:/var/db/fpsd:/usr/bin/false\n",
      "_timed:*:266:266:Time Sync Daemon:/var/db/timed:/usr/bin/false\n",
      "_reportmemoryexception:*:269:269:ReportMemoryException:/var/db/reportmemoryexception:/usr/bin/false\n"
     ]
    }
   ],
   "source": [
    "for one_line in open('/etc/passwd'):\n",
    "    if not one_line.startswith(\"#\"):\n",
    "        print(one_line, end='')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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