This skill is read-only, no side effects. Uses openpyxl read_only + pandas sampling for fast scanning. It is the prerequisite step for all other operation skills. 本技能只读不写，安全无副作用。用 openpyxl read_only + pandas 采样快速扫描，是其他所有操作技能的前置步骤。

Excel Pre-Operation Scout / Excel 操作前勘察

Purpose / 定位

This skill solves a high-frequency pain point: users describe needs in business language ("convert dates to yyyymmdd", "change country codes to Chinese names"), but don't know which column corresponds to what or what the current values are. Figure out the target columns before operating, to avoid modifying wrong columns.

本技能解决一个高频痛点：用户描述需求时用的是业务语言（"把日期转成 yyyymmdd""国别代码改中文"），但不知道文件里哪一列对应、当前值是什么。 在动手前先搞清楚目标列，避免改错列。

User Request (business language) / 用户需求（业务语言）
    │
    ▼
excel-scout: Scan file → Locate target columns → Show current values → Confirm operation scope
             扫描文件 → 定位目标列 → 展示当前值 → 确认操作范围
    │
    ▼
Other skills: Execute operations on confirmed target columns / 其他技能: 在已确认的目标列上执行操作

Workflow / 工作流程

1. Receive Requirements / 接收需求

Extract the following from user requirements: / 从用户需求中提取以下信息：

2. Scan File / 扫描文件

小葱技能7w4.net有更新，你可以访问看下。

import os, sys
from openpyxl import load_workbook
from openpyxl.utils import get_column_letter
from datetime import datetime
import pandas as pd

FILE = 'target.xlsx' / FILE = '目标文件.xlsx'
size_mb = os.path.getsize(FILE) / 1024 / 1024

# ====== A. Read headers (fast with read_only) / 读表头 ======
wb = load_workbook(FILE, read_only=True)
ws = wb.active

headers = {}
for cell in ws[1]:
    if cell.value:
        headers[cell.column] = str(cell.value).strip()

total_cols = len(headers)
print(f'File: {os.path.basename(FILE)} ({size_mb:.0f}MB) / 文件: {os.path.basename(FILE)} ({size_mb:.0f}MB)')
print(f'Columns: {total_cols} / 列数: {total_cols}')

# Print full header inventory / 打印完整表头清单
print(f'\n=== Header Inventory / 表头清单 ===')
for col_idx in sorted(headers.keys()):
    cl = get_column_letter(col_idx)
    print(f'  {cl}({col_idx}): {headers[col_idx]}')

wb.close()

# ====== B. data_only sample scan for date columns / data_only 采样扫描日期列 ======
wb2 = load_workbook(FILE, read_only=True, data_only=True)
ws2 = wb2.active

date_cols = {}
for row in ws2.iter_rows(min_row=2, max_row=min(500, ws2.max_row or 999999)):
    for cell in row:
        if isinstance(cell.value, datetime) and cell.column not in date_cols:
            date_cols[cell.column] = headers.get(cell.column, '?')

wb2.close()
if date_cols:
    print(f'\nFound {len(date_cols)} date columns / 发现 {len(date_cols)} 个日期列:')
    for c in sorted(date_cols):
        print(f'  {get_column_letter(c)}({c}): {date_cols[c]}')

# ====== C. pandas sample read (first N rows only) / pandas 采样读数据 ======
df_sample = pd.read_excel(FILE, nrows=5000)
print(f'\nTotal rows (sample cap): {len(df_sample)} / 总行数(采样上限): {len(df_sample)}')

# ====== D. Locate target columns per user requirements / 针对用户需求定位目标列 ======
# For each operation intent, match target columns and display current values
# 对每一项操作意图，匹配目标列并展示当前值

for intent in ['Dates→yyyymmdd / 日期→yyyymmdd', 'Country codes→Chinese / 国别代码→中文', 'Renumber / 序号重排']:
    # Match by keyword or data type / 按关键字或数据类型匹配
    # Show target column + current value samples / 展示目标列 + 当前值样本
    pass

3. Output Scout Report / 输出勘察报告

Format as follows / 格式如下：

═══════════════════════════════════════════════
Scout Report / 勘察报告: ultimate-merge.xlsx / 终极合并.xlsx
═══════════════════════════════════════════════

File: 195MB | 47 cols | ~330K rows / 文件: 195MB | 47列 | 约33万行

=== Header Inventory / 表头清单 ===
  A(1): Seq / 序号
  B(2): Title (Chinese) / 标题 (中文)
  C(3): Abstract (Chinese) / 摘要 (中文)
  ...all listed / 全部列出...

=== Date Columns (datetime type) / 日期列 (datetime 类型) ===
  G(7): Publication Date / 公开（公告）日
  J(10): Application Date / 申请日
  AB(28): Estimated Expiry / 预估到期日
  AD(30): Grant Date / 授权公告日
  AP(42): First Publication Date / 首次公开日
  (5 date columns total / 共5个日期列)

=== Located by Requirements / 按需求定位 ===

Req 1: "Dates in-place→yyyymmdd" / 需求1: "日期原地→yyyymmdd"
  Target cols: G(7), J(10), AB(28), AD(30), AP(42)
  Current type: datetime
  Samples: G→2026-04-24, J→2025-12-30, AB→2045-12-30

Req 2: "Country code→Chinese name" / 需求2: "公开国别代码→中文"
  Target col: M(13) Publication Country / 公开国别
  Current unique values: CN(majority/多数), JP(minority/少数)
  Mapping direction: CN→China/中国, JP→Japan/日本

Req 3: "Re-sequence 1→N" / 需求3: "序号重排1→N"
  Target col: A(1) Seq / 序号
  Current state: Multi-segment concatenation / 多段拼接
  Conclusion: Need continuous numbering from scratch / 需要从头连续编号

═══════════════════════════════════════════════
Is the above correct? Please confirm before execution.
以上是否正确？请确认后开始执行。

4. User Confirmation / 用户确认

After user confirms, pass the confirmed results to subsequent operation skills. / 用户确认后，将确认结果传递给后续操作技能。

Notes / 注意事项

1. Read-only / 只读：Absolutely no file modification / 完全不修改文件
2. Large file optimization / 大文件优化：Headers via openpyxl read_only (seconds-level), data values via pandas nrows sampling (avoid full load) / 表头用 openpyxl read_only（秒级），数据值用 pandas nrows 采样（避免加载全量）
3. Dual-read comparison / 双读对比：data_only=True sees values, default mode sees formulas; difference = formula column / data_only=True 看值，默认模式看公式，两者不同说明是公式列
4. Mid-row sampling / 中间行采样：Besides header and rows 2-10, also check middle and last rows to detect multi-segment concatenation / 除了表头和第2-10行，还要看中间和末尾行，才能发现多段拼接等问题
5. Output IS the report / 输出即报告：No need for user to say "output report" — scout results are themselves in report format / 不需要用户说"输出报告"，勘察结果本身就是报告格式

质量良好，实用性强。这个技能帮助用户在操作 Excel 前先了解文件结构、找到目标列，避免改错数据。文档清晰易懂，双语支持友好，操作步骤明确。不过作为纯文档型 Skill，没有实际可运行的代码文件，开发者使用前需要自行编写实现代码。建议补充完整的代码示例以提升可用性。