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Commit 8be44f3

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feat: add pandas solution to lc problem: No.0550 (#1891)
* Solution for 511. * Solution for 550. * Update README.md * Update README_EN.md * Update Solution.py * Update Solution.py * Update README_EN.md * Update README.md
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‎solution/0500-0599/0550.Game Play Analysis IV/README.md‎

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WHERE rk = 1;
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```
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### **Pandas**
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```python
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import pandas as pd
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def gameplay_analysis(activity: pd.DataFrame) -> pd.DataFrame:
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activity["first"] = activity.groupby("player_id").event_date.transform(min)
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activity_2nd_day = activity[
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activity["first"] + pd.DateOffset(1) == activity["event_date"]
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]
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return pd.DataFrame(
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{"fraction": [round(len(activity_2nd_day) / activity.player_id.nunique(), 2)]}
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)
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```
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‎solution/0500-0599/0550.Game Play Analysis IV/README_EN.md‎

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WHERE rk = 1;
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```
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### **Pandas**
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```python
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import pandas as pd
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def gameplay_analysis(activity: pd.DataFrame) -> pd.DataFrame:
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activity["first"] = activity.groupby("player_id").event_date.transform(min)
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activity_2nd_day = activity[
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activity["first"] + pd.DateOffset(1) == activity["event_date"]
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]
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return pd.DataFrame(
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{"fraction": [round(len(activity_2nd_day) / activity.player_id.nunique(), 2)]}
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)
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```
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import pandas as pd
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def gameplay_analysis(activity: pd.DataFrame) -> pd.DataFrame:
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activity["first"] = activity.groupby("player_id").event_date.transform(min)
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activity_2nd_day = activity[
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activity["first"] + pd.DateOffset(1) == activity["event_date"]
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]
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return pd.DataFrame(
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{"fraction": [round(len(activity_2nd_day) / activity.player_id.nunique(), 2)]}
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)

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