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Add Chapter 11.7 challenge solution

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ch11-file-input-and-output
- 7-challenge-create-a-high-scores-list.py
- practice_files
  - scores.csv

2 files changed

+44

-1

lines changed

`‎ch11-file-input-and-output/7-challenge-create-a-high-scores-list.py`

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	`1`	`+# 11.7 Challenge: Create a High Scores List`
	`2`	`+# Solution to Challenge`
	`3`	`+`
	`4`	`+importcsv`
	`5`	`+frompathlibimportPath`
	`6`	`+`
	`7`	`+# Change the path below to match the location on your computer`
	`8`	`+scores_csv_path= (`
	`9`	`+Path.home()/`
	`10`	`+"github/realpython"/`
	`11`	`+"python-basics-exercises"/`
	`12`	`+"ch11-file-input-and-output"/`
	`13`	`+"practice_files"/`
	`14`	`+"scores.csv"`
	`15`	`+)`
	`16`	`+`
	`17`	`+withscores_csv_path.open(mode="r",encoding="utf-8")asfile:`
	`18`	`+reader=csv.DictReader(file)`
	`19`	`+scores= [rowforrowinreader]`
	`20`	`+`
	`21`	`+high_scores= {}`
	`22`	`+foriteminscores:`
	`23`	`+name=item["name"]`
	`24`	`+score=item["score"]`
	`25`	`+# If the name has not been added to the high_score dictionary, then`
	`26`	`+# create a new key with the name and set its value to the score`
	`27`	`+ifnamenotinhigh_scores:`
	`28`	`+high_scores[name]=score`
	`29`	`+# Otherwise, check to see if score is greater than the score currently`
	`30`	`+# assigned to high_scores[name] and replace it if it is`
	`31`	`+else:`
	`32`	`+ifscore>high_scores[name]:`
	`33`	`+high_scores[name]=score`
	`34`	`+`
	`35`	`+# The high_scores dictionary now contains one key for each name that was`
	`36`	`+# in the scores.csv file, and each value is that player's highest score.`
	`37`	`+`
	`38`	`+output_csv_file=Path.home()/"high_scores.csv"`
	`39`	`+withoutput_csv_file.open(mode="w",encoding="utf-8")asfile:`
	`40`	`+writer=csv.DictWriter(file,fieldnames=["name","high_score"])`
	`41`	`+fornameinhigh_scores:`
	`42`	`+row_dict= {"name":name,"high_score":high_scores[name]}`
	`43`	`+writer.writerow(row_dict)`

`‎ch11-file-input-and-output/practice_files/scores.csv`

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`@@ -1,4 +1,4 @@`
`1`		`-name,score`
	`1`	`+name,score`
`2`	`2`	`LLCoolDave,23`
`3`	`3`	`LLCoolDave,27`
`4`	`4`	`red,12`

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Commitee13e03

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`‎ch11-file-input-and-output/7-challenge-create-a-high-scores-list.py`

`‎ch11-file-input-and-output/practice_files/scores.csv`

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