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解题方法

Method 1: Read All Lines​

适用场景​

文件行数已知或未知，需要全部读入数组。

步骤​

  1. f = open(filename, 'r')
  2. lines = f.read().splitlines()
  3. f.close()
  4. 遍历 lines 处理每行数据
def ReadAll(filename):
    try:
        f = open(filename, 'r')
        lines = f.read().splitlines()
        f.close()
        return lines
    except:
        print("File not found")
        return []

Method 2: Read Line by Line​

适用场景​

需要逐行处理，或行数未知。

def ReadLineByLine(filename):
    try:
        f = open(filename, 'r')
        line = f.readline()
        while line != "":
            line = line.strip()
            # 处理这一行
            print(line)
            line = f.readline()
        f.close()
    except:
        print("File not found")

Method 3: Read Fixed Number of Lines​

适用场景​

题目明确指定文件中有固定行数（如 25 行）。

def ReadFixed(filename):
    try:
        f = open(filename, 'r')
        arr = []
        for i in range(25):
            val = int(f.readline().strip())
            arr.append(val)
        f.close()
        return arr
    except:
        print("File not found")
        return []

Method 4: Write to File​

适用场景​

需要将数据保存到文件。

def SaveToFile(filename, data):
    try:
        f = open(filename, 'w')
        for i in range(len(data)):
            f.write(str(data[i]) + "\n")
        f.close()
    except:
        print("Error writing file")

Method 5: Append to File​

适用场景​

需要在文件末尾追加数据而不是覆盖。

def AppendToFile(filename, item):
    try:
        f = open(filename, 'a')
        f.write(str(item) + "\n")
        f.close()
    except:
        print("Error appending to file")

Method 6: Parse CSV Line​

适用场景​

文件每行包含逗号分隔的多个字段。

def ParseCSV(line):
    parts = line.split(",")
    field1 = parts[0]
    field2 = int(parts[1])
    field3 = parts[2]
    # 根据题目需求继续处理
    return field1, field2, field3

Method 7: Exception Handling Pattern​

适用场景​

任何文件操作都需要异常处理。

try:
    f = open("filename.txt", 'r')
    # 文件操作
    f.close()
except FileNotFoundError:
    print("File not found")
except:
    print("An error occurred")