Python cs50 pset7语法

我正在处理问题的

花名册.py

部分，我得到了错误：

   File "roster.py", line 17
    print(f"{row["first"]} {row["middle"]} {row["last"]}, born {row["birth"]}")
                      ^
SyntaxError: invalid syntax

我的代码：

import sys
from cs50 import SQL

if len(sys.argv) != 2:
    print("Needs two command-line argument")
    exit(1)

db = SQL("sqlite:///students.db")

house = sys.argv[1]

results = db.execute("SELECT * FROM students WHERE house = ?", house)


for row in results:
    if row["middle"] != None:
        print(f"{row["first"]} {row["middle"]} {row["last"]}, born {row["birth"]}")
    else:
        print(f"{row["first"]} {row["last"]}, born {row["birth"]}")

---

如果您试图打印行[“middle”]值等，请使用此选项

for row in results:
    if row["middle"] != None:
        print(f"{"+row["first"]+"} {"+row["middle"]+"} {"+row["last"]+"}, born {"+row["birth"]+"}")
    else:
       print(f"{"+row["first"]+"} {"+row["last"]+"}, born {"+row["birth"]+"}")

---

如果您试图打印行[“middle”]值等，请使用此选项

for row in results:
    if row["middle"] != None:
        print(f"{"+row["first"]+"} {"+row["middle"]+"} {"+row["last"]+"}, born {"+row["birth"]+"}")
    else:
       print(f"{"+row["first"]+"} {"+row["last"]+"}, born {"+row["birth"]+"}")

---

你的报价是错误的。试试这个：

for row in results:
    if row["middle"] != None:
        print(f'{row["first"]} {row["middle"]} {row["last"]}, born {row["birth"]}')
    else:
        print(f'{row["first"]} {row["last"]}, born {row["birth"]}')

---

你的报价是错误的。试试这个：

for row in results:
    if row["middle"] != None:
        print(f'{row["first"]} {row["middle"]} {row["last"]}, born {row["birth"]}')
    else:
        print(f'{row["first"]} {row["last"]}, born {row["birth"]}')

---

您正在尝试打印第[“第一”]行还是第[“+first+”]行？错误消息的哪些部分不清楚？您可能希望转义不应以字符串结尾的引号？您是否正在尝试打印第[“first”]行或第[“+first+”]行？错误消息的哪些部分不清楚？可能您想转义不应该结束字符串的引号？