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Lecture #17
File Handling - Text File (Part 1/4)
file open modes with clause read methods write methods seek() and tell()
AI Prompt Builder
.txt
You are an expert CBSE Class XII Computer Science teacher, examiner, and study material creator.

===========================================
SCOPE — READ BEFORE GENERATING ANYTHING
===========================================
Today's lecture covers ONE topic only: "File Handling – Text File"
Lecture number 17 of 98 | Duration: 35 minutes | Board: CBSE
Chapter: Computational Thinking and Programming

HARD RULE: Every piece of content you generate — notes, examples, questions, tips —
must be directly relevant to "File Handling – Text File" only.
DO NOT pull content, examples, or questions from any other topic or chapter.

===========================================
SECTION 1: LECTURE INFORMATION
===========================================

Class: XII CS | Subject: Computer Science | Board: CBSE
Topic: File Handling - Text File (Part 1/4)
Subtopics to cover today:
- file open modes
- with clause
- read methods
- write methods
- seek() and tell()

Student level: Class XII, CBSE Board, average to above-average students preparing for board exams

===========================================
SECTION 2: TEACHER'S REFERENCE NOTES
===========================================

File Handling - Text File

Open modes: r, r+, w, w+, a, a+. with clause. write(), writelines(). read(), readline(), readlines(). seek() and tell(). Manipulation of text file data.

Teaching ideas: Moderate frequency – use a worked example + one practice problem. Highlight the exam pattern seen in PYQs.

===========================================
SECTION 3: PYQ FREQUENCY DATA (Year-wise)
===========================================

Teaching priority: MEDIUM
High-yield concepts: file open modes, with clause, read methods, write methods, seek() and tell()

Appearances: 11 times across 6 papers | Total marks: ~23

===========================================
SECTION 4: ACTUAL PREVIOUS YEAR QUESTIONS
(Scope: "File Handling – Text File" only — 0 questions from board papers)
===========================================

USE THESE QUESTIONS TO BUILD ALL CONTENT.
- Derive learning objectives from what they test
- Build examples from the concepts they probe
- Identify tricks from how they are worded
- Design homework and assessment in the same style

PYQ INSIGHT: This topic has appeared 11 times across 6 papers, carrying ~23 marks. Weightage in analysed papers: 4.3%.
High-yield concepts: file open modes, with clause, read methods, write methods, seek() and tell().

===========================================
No PYQ pattern data available.

===========================================
No importance data available.

===========================================
EXAMINER FINGERPRINT — Tricks this topic's questions reuse every year
===========================================
Build dedicated content boxes around EACH trick below:

- r vs r+ vs w vs w+ mode confusion (r+ keeps content, w+ truncates)
- readline() keeps \n; strip() removes it — MCQ trap
- seek(0) resets pointer to beginning
- tell() returns byte position, not line number

===========================================
YOUR TASK — Generate a complete classroom-ready teaching package
===========================================

Output format: FULL HTML (print-ready, A4, same format as CBSE study material).
Use the CSS classes below. NO plain Markdown — use HTML elements only.

HTML STRUCTURE TO GENERATE:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>File Handling - Text File (Part 1/4) — Lecture 17</title>
<style>
/* ── PRINT SETUP ── */
@page { size: A4; margin: 12mm 14mm 12mm 14mm; }
* { box-sizing: border-box; }

/* ── BASE ── */
body { font-family: 'Segoe UI', Arial, sans-serif; font-size: 9.5pt; color: #1a1a2e; line-height: 1.4; background: #fff; margin: 0; padding: 0; }

/* ── HEADINGS ── */
h1 { font-size: 17pt; text-align: center; color: #16213e; border-bottom: 3px solid #e94560; padding-bottom: 5px; margin: 0 0 8px; }
h2 { font-size: 12pt; color: #0f3460; background: linear-gradient(90deg,#e8f4f8,#fff); padding: 5px 10px; margin: 14px 0 6px; border-left: 5px solid #e94560; }
h3 { font-size: 10.5pt; color: #16213e; border-bottom: 1.5px dashed #ccc; padding-bottom: 3px; margin: 10px 0 4px; }

/* ── CONTENT BOXES ── */
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.key-box ul { margin:3px 0 0 12px; padding:0; }
.key-box li { margin:2px 0; }
.example-box { background:#f3e5f5; border-left:3px solid #7b1fa2; padding:4px 8px; margin:4px 0; font-size:9pt; border-radius:0 4px 4px 0; }
.warn-box { background:#ffebee; border-left:3px solid #c62828; padding:4px 8px; margin:4px 0; font-size:9pt; border-radius:0 4px 4px 0; }
.warn-box::before { content: "⚠ EXAMINER TRAP: "; font-weight:bold; color:#e65100; }
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.pyq-box .pyq-meta { font-size:7.5pt; color:#e65100; font-weight:bold; margin-bottom:3px; }
.mcq-box { background:#f8f9fa; border:1px solid #dee2e6; padding:6px 10px; margin:5px 0; border-radius:4px; font-size:9pt; }
.options { list-style:none; margin:4px 0 0 0; padding:0; }
.options li { padding:2px 0; }
.options li.wrong { color:#c62828; }
.options li.correct { color:#2e7d32; font-weight:bold; }
.options .why { font-size:8pt; color:#555; margin-left:8px; font-style:italic; }
.self-test-box { background:#e8eaf6; border:1px dashed #5c6bc0; padding:6px 10px; margin:6px 0; border-radius:4px; font-size:9pt; }
details summary {
  cursor:pointer; display:inline-block; margin-top:6px; padding:2px 10px;
  background:#e8eaf6; color:#3949ab; border:1px solid #9fa8da;
  border-radius:4px; font-size:8.5pt; font-weight:600; user-select:none;
  list-style:none;
}
details summary::-webkit-details-marker { display:none; }
details[open] > summary { background:#c5cae9; }
details > *:not(summary) { margin-top:6px; }

/* ── CODE ── */
pre { background:#f8f9fa; color:#212529; border:1px solid #dee2e6; border-radius:4px; margin:4px 0; padding:8px 10px; font-size:8.5pt; line-height:1.5; white-space:pre-wrap; word-break:break-word; }
pre code { white-space:pre; word-break:normal; display:block; overflow-x:auto; }
code { font-family:'Courier New',monospace; font-size:8.5pt; }
.kw { color:#0000ff; } .bi { color:#267f99; } .st { color:#a31515; }
.cm { color:#008000; } .nm { color:#098658; } .fn { color:#795e26; }
.va { color:#001080; }

/* ── TABLES ── */
table { border-collapse:collapse; width:100%; margin:5px 0; font-size:8.5pt; }
th, td { border:1px solid #bbb; padding:3px 6px; text-align:left; }
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/* ── CARDS ── */
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.card { background:#fff; border:1px solid #ccc; border-radius:4px; padding:6px 8px; font-size:8.5pt; }
.card .card-title { font-weight:bold; font-size:9pt; color:#0f3460; margin-bottom:3px; border-bottom:1px solid #eee; padding-bottom:2px; }

/* ── PRIORITY TAGS ── */
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.critical { background:#fce4ec; color:#ad1457; }
.high { background:#fff3e0; color:#e65100; }
.medium { background:#fff8e1; color:#f57f17; }
.marks-badge { display:inline-block; background:#e94560; color:#fff; font-size:7.5pt; padding:1px 5px; border-radius:10px; font-weight:bold; margin-left:5px; }

/* ── TOC STICKY SIDEBAR (screen only) ── */
@media screen {
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  .main-content { padding:10px 14px; min-width:0; }
}
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  .main-content { grid-column:1 / -1; padding:8px; }
}
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  .print-bar { display:none; }
  .collapse-btn { display:none !important; }
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  /* Force all <details> open and hide the toggle-button summary text */
  details { display:block !important; }
  details > *:not(summary) { display:block !important; visibility:visible !important; }
  details > summary { display:none !important; }
}

/* ── PRINT BUTTONS ── */
.print-bar { position:fixed; top:8px; right:8px; display:flex; gap:6px; z-index:999; }
.print-btn { padding:5px 14px; color:#fff; border:none; border-radius:4px; cursor:pointer; font-size:9pt; box-shadow:0 2px 6px rgba(0,0,0,0.3); }
.print-btn.color-btn { background:#e94560; }
.print-btn.bw-btn { background:#333; }
.print-btn.back-btn { background:#1976d2; display:none; }

/* ── B&W MODE OVERRIDES ── */
body.bw-mode { background:#fff !important; color:#000 !important; }
body.bw-mode .def-box, body.bw-mode .key-box, body.bw-mode .example-box,
body.bw-mode .warn-box, body.bw-mode .tip-box, body.bw-mode .recall-box,
body.bw-mode .pyq-box, body.bw-mode .mcq-box, body.bw-mode .self-test-box {
  background:#fff !important; border:1px solid #ccc !important; border-left:none !important;
}
body.bw-mode h1 { color:#000 !important; border-bottom:2px solid #000 !important; }
body.bw-mode h2 { background:#fff !important; border-left:2px solid #000 !important; color:#000 !important; }
body.bw-mode h3 { color:#000 !important; border-bottom:1px solid #000 !important; }
body.bw-mode pre { background:#fff !important; color:#000 !important; border:1px solid #ccc !important; }
body.bw-mode .kw, body.bw-mode .bi, body.bw-mode .st, body.bw-mode .cm,
body.bw-mode .nm, body.bw-mode .fn, body.bw-mode .va { color:#000 !important; }
body.bw-mode table th { background:#eee !important; color:#000 !important; }
body.bw-mode tr:nth-child(even) { background:#fff !important; }
body.bw-mode .priority-tag, body.bw-mode .marks-badge { background:#fff !important; color:#000 !important; border:1px solid #000 !important; }
body.bw-mode .card { background:#fff !important; border:1px solid #ccc !important; }
body.bw-mode .highlight-row { background:#fff !important; }
body.bw-mode .toc-sidebar { background:#fff !important; border-right:1px solid #ccc !important; }
body.bw-mode .toc-sidebar a { color:#000 !important; }

/* ── COLLAPSIBLE SECTIONS ── */
.collapse-btn { float:right; background:none; border:none; cursor:pointer; font-size:10pt; color:#aaa; padding:0 4px; margin-left:6px; }
.collapse-btn:hover { color:#e94560; }
</style>
</head>
<body>

<!-- Print / mode buttons (hidden on print) -->
<div class="print-bar">
  <button class="print-btn back-btn" id="btnBackColor" onclick="backToColor()">&#127775; Back to Color</button>
  <button class="print-btn bw-btn"   id="btnPrintBW"   onclick="printBW()">&#128438; Print B&amp;W</button>
  <button class="print-btn color-btn"                  onclick="printColor()">&#128438; Print Color</button>
</div>

<!-- JS: print modes + collapsible sections + TOC auto-build -->
<script>
function printColor() {
  document.body.classList.remove('bw-mode');
  document.getElementById('btnPrintBW').style.display='inline-block';
  document.getElementById('btnBackColor').style.display='none';
  window.print();
}
function printBW() {
  document.body.classList.add('bw-mode');
  document.getElementById('btnPrintBW').style.display='none';
  document.getElementById('btnBackColor').style.display='inline-block';
  window.print();
}
function backToColor() {
  document.body.classList.remove('bw-mode');
  document.getElementById('btnPrintBW').style.display='inline-block';
  document.getElementById('btnBackColor').style.display='none';
}

// Auto-collapsible h2/h3 sections
(function(){
  function setup(){
    document.querySelectorAll('.main-content h2,.main-content h3').forEach(function(h){
      var btn=document.createElement('button');
      btn.className='collapse-btn';btn.textContent='▼';
      h.appendChild(btn);
      var wrapper=document.createElement('div');wrapper.className='section-body';
      var level=parseInt(h.tagName[1]),next=h.nextElementSibling;
      while(next){
        var tag=next.tagName||'';
        if(/^H[1-6]$/.test(tag)&&parseInt(tag[1])<=level)break;
        var after=next.nextElementSibling;wrapper.appendChild(next);next=after;
      }
      h.insertAdjacentElement('afterend',wrapper);
      btn.addEventListener('click',function(e){
        e.stopPropagation();
        var open=wrapper.style.display!=='none';
        wrapper.style.display=open?'none':'';
        btn.textContent=open?'▶':'▼';
      });
    });
    // Expand/Collapse All in TOC
    var toc=document.querySelector('.toc-sidebar');
    if(toc){
      var bar=document.createElement('div');
      bar.style.cssText='display:flex;gap:4px;margin-bottom:8px;';
      ['Expand All','Collapse All'].forEach(function(label){
        var b=document.createElement('button');
        b.textContent=label;
        b.style.cssText='flex:1;font-size:7.5pt;padding:2px 4px;border:1px solid #ccc;border-radius:3px;cursor:pointer;background:#fff;';
        b.addEventListener('click',function(){
          var expand=label==='Expand All';
          document.querySelectorAll('.section-body').forEach(function(w){w.style.display=expand?'':'none';});
          document.querySelectorAll('.collapse-btn').forEach(function(b){b.textContent=expand?'▼':'▶';});
        });
        bar.appendChild(b);
      });
      toc.insertBefore(bar,toc.firstChild);
    }
    // Auto-build TOC links from h2/h3 IDs
    if(toc){
      document.querySelectorAll('.main-content h2,.main-content h3').forEach(function(h){
        if(!h.id){h.id=h.textContent.trim().replace(/[^a-z0-9]+/gi,'-').toLowerCase().slice(0,40);}
        var a=document.createElement('a');
        a.href='#'+h.id;
        a.textContent=h.textContent.replace('▼','').replace('▶','').trim();
        if(h.tagName==='H3')a.classList.add('toc-h3');
        toc.appendChild(a);
      });
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  }
  if(document.readyState==='loading'){document.addEventListener('DOMContentLoaded',setup);}else{setup();}
})();

// Auto-open details when printing
(function(){
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})();
</script>

<!-- TOC SIDEBAR -->
<nav class="toc-sidebar" aria-label="Table of Contents">
  <h4>&#128214; Contents</h4>
  <!-- TOC links auto-built by JS above -->
</nav>

<!-- MAIN CONTENT -->
<div class="main-content">

Generate these sections in order (all inside the main-content div):

<h1 id="top">File Handling - Text File (Part 1/4) — Lecture 17</h1>
<p style="text-align:center;color:#555;font-size:8.5pt;">CBSE | XII CS | Computational Thinking and Programming | 35 min</p>

<h2 id="s1">1. Learning Objectives</h2>
[3–5 objectives derived from what the PYQs above test — use &lt;ul&gt;&lt;li&gt;]

<h2 id="s2">2. 35-Minute Lecture Flow</h2>
[HTML table: Time | Activity | Teacher Action — include a PYQ discussion slot]

<h2 id="s3">3. Concept Notes</h2>
[For EVERY sub-concept tested in PYQs:
  - .def-box for definition (with "In exam language: ..." line)
  - .key-box with syntax/rules as &lt;ul&gt;&lt;li&gt;
  - .example-box for worked examples
  - &lt;pre&gt;&lt;code&gt; for code with .kw/.bi/.st/.cm/.nm token spans
  - .recall-box for Output with exact expected output
  After each concept, embed 1–2 actual PYQs in .pyq-box with .pyq-meta (year · marks · type)]

<h2 id="s4">4. Examiner Tricks &amp; Common Mistakes</h2>
[One .warn-box per trick from Section 5 — be specific, give the wrong vs right answer]

<h2 id="s5">5. Board Work Plan</h2>
[Numbered list: exactly what to write on the blackboard, in order]

<h2 id="s6">6. Classroom Practice Questions</h2>
[Modelled on PYQ style. CRITICAL: every answer MUST be inside &lt;details&gt;&lt;summary&gt;▶ View Answer&lt;/summary&gt;...&lt;/details&gt; — never expose the answer directly.

3×1M MCQ — use this exact structure:
&lt;div class="mcq-box"&gt;
  &lt;b&gt;Q1.&lt;/b&gt; Question text?&lt;br&gt;
  &lt;ul class="options"&gt;
    &lt;li&gt;a) ...&lt;/li&gt;
    &lt;li&gt;b) ...&lt;/li&gt;
    &lt;li&gt;c) ...&lt;/li&gt;
    &lt;li&gt;d) ...&lt;/li&gt;
  &lt;/ul&gt;
  &lt;details&gt;&lt;summary&gt;▶ View Answer&lt;/summary&gt;
    &lt;ul class="options"&gt;
      &lt;li class="wrong"&gt;a) ... — reason why wrong&lt;/li&gt;
      &lt;li class="correct"&gt;b) ... ✓ — reason why correct&lt;/li&gt;
      ...
    &lt;/ul&gt;
  &lt;/details&gt;
&lt;/div&gt;
(Note: options list shown WITHOUT .correct/.wrong BEFORE the details; INSIDE details show all options with correct/wrong analysis.)

3×2M short answer in .self-test-box:
&lt;div class="self-test-box"&gt;&lt;b&gt;Q4.&lt;/b&gt; Question&lt;br&gt;&lt;details&gt;&lt;summary&gt;▶ View Answer&lt;/summary&gt;Full answer&lt;/details&gt;&lt;/div&gt;

2×3-5M programming in .self-test-box:
&lt;div class="self-test-box"&gt;&lt;b&gt;Q7.&lt;/b&gt; Question&lt;br&gt;&lt;details&gt;&lt;summary&gt;▶ View Answer&lt;/summary&gt;&lt;pre&gt;&lt;code&gt;...code...&lt;/code&gt;&lt;/pre&gt;&lt;/details&gt;&lt;/div&gt;

1 HOTS in .self-test-box with &lt;details&gt;&lt;summary&gt;▶ View Answer&lt;/summary&gt;answer&lt;/details&gt;]

<h2 id="s7">7. PYQ Discussion (All 0 Questions)</h2>
[For EVERY single PYQ provided in Section 4 — no skipping.
Use this structure for each question:
  &lt;div class="pyq-box"&gt;
    &lt;div class="pyq-meta"&gt;[YEAR] · [X] Marks · [TYPE] · Section-[S]&lt;/div&gt;
    &lt;b&gt;Q.&lt;/b&gt; [full question text — include code if any]&lt;br&gt;&lt;br&gt;
    &lt;b&gt;Concept tested:&lt;/b&gt; [concept name]&lt;br&gt;
    &lt;details&gt;&lt;summary&gt;▶ View Model Answer&lt;/summary&gt;
      &lt;b&gt;Model Answer:&lt;/b&gt; [full answer with code/table as needed, using .kw/.bi/.st token spans in &lt;pre&gt;&lt;code&gt;]&lt;br&gt;
      &lt;b&gt;Common mistake:&lt;/b&gt; [what students get wrong — be specific]
    &lt;/details&gt;
  &lt;/div&gt;]

<h2 id="s8">8. Student Notes (Copy-ready)</h2>
[Concise notes — every concept from PYQs — in .key-box and .def-box; self-check questions in .self-test-box with &lt;details&gt;&lt;summary&gt;▶ View Answer&lt;/summary&gt;answer&lt;/details&gt;]

<h2 id="s9">9. Homework</h2>
[2×1M + 2×2M + 1×3M + 1×5M — same PYQ pattern; mark difficulty with .critical/.high/.medium tag.
EVERY answer wrapped in &lt;details&gt;&lt;summary&gt;▶ View Answer&lt;/summary&gt;...&lt;/details&gt; inside .self-test-box or .mcq-box]

<h2 id="s10">10. Exam Tips</h2>
[5 specific tips as .tip-box — derived from PYQ patterns for THIS topic only]

<h2 id="s11">11. Last-Minute Revision Cards</h2>
&lt;div class="card-grid"&gt;
[One .card per concept: &lt;div class="card-title"&gt;[concept]&lt;/div&gt; + 1 rule + 1 example]
&lt;/div&gt;

</div><!-- end .main-content -->
</body>
</html>

HARD OUTPUT RULES:
- Output ONLY the HTML document starting with &lt;!DOCTYPE html&gt;
- Do NOT wrap in markdown code fences
- Do NOT add explanatory text outside the HTML
- Use ONLY content from "File Handling – Text File" — zero content from other topics
- Every PYQ in Section 4 MUST appear in Section 7 (PYQ Discussion) — no skipping
- ANSWER HIDING (most important for student use):
    * Section 6 MCQs: options listed WITHOUT .correct/.wrong BEFORE details; full analysis only INSIDE &lt;details&gt;
    * Section 6 short/programming/HOTS, Section 8 self-check, Section 9 homework: EVERY answer in &lt;details&gt;&lt;summary&gt;▶ View Answer&lt;/summary&gt;
    * Section 7 PYQ Discussion: model answer + common mistake inside &lt;details&gt;&lt;summary&gt;▶ View Model Answer&lt;/summary&gt;
    * The beforeprint JS already auto-opens all &lt;details&gt; for printing — never skip this feature
- .pyq-box question text and concept must be OUTSIDE details (always visible); only the answer is hidden
- All content goes inside &lt;div class="main-content"&gt;
- The &lt;nav class="toc-sidebar"&gt; is already in the template — JS auto-builds TOC links
- Print buttons (.print-bar) are in the template — DO NOT add them again; they auto-hide on print
- Include the full CSS and JS exactly as given — do not simplify or omit any rule
21958 chars · ~2268 words Ready to paste into ChatGPT, Claude, Gemini, or DeepSeek
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