file1=open("E:/大一/python与程序设计/file1.txt","r") l1=file1.readline() l2=file1.readline() l3=file1.readline() lst1=l1.split() num1=list(map(int,lst1)) num1.sort() lst2=l2.split() num2=list(map(int,lst2)).sort() lst3=l3.split() num3=list(map(int,lst3)).sort() content=[num1,num2,num3] file2=open("file2.txt","w") file2.writelines(content) file2.close() file1.close()

你的代码有一些问题。首先，使用`readline()`方法逐行读取文件内容是一个可行的方法，但是需要考虑到文件中可能存在多行内容的情况，因此应该使用循环来读取所有行。其次，`sort()`方法会对列表进行排序并返回`None`，因此不能将其结果赋值给变量。最后，`writelines()`方法需要传入一个字符串列表，而你的`content`变量是一个二维列表，需要将其转换为字符串格式后再写入文件。

修改后的代码如下：

with open("E:/大一/python与程序设计/file1.txt", "r") as f1, open("file2.txt", "w") as f2:
    # 逐行读取文件内容并按升序排列
    content = []
    for line in f1:
        nums = list(map(int, line.split()))
        nums.sort()
        content.append(" ".join(map(str, nums)) + "\n")
    # 将排好序的内容写入file2.txt
    f2.writelines(content)

请注意，你需要将文件路径`"E:/大一/python与程序设计/file1.txt"`替换为你实际使用的文件路径。

相关问题

#第二次作业 #26 #(1) lst=[1,2,3,4,5] square=map(lambda x:x*x,lst) print(list(square)) #(2) even=filter(lambda x:x%2==0,lst) print(list(even)) #27 #(1) file1=open("E:/大一/python与程序设计/file1.txt","r") content1=file1.read() lst1=content1.split() num=list(map(int,lst1)) allnum=sum(num) print(allnum) file1.close() #(2) file1=open("E:/大一/python与程序设计/file1.txt","r") content=[] for i in range(1,4): l=file1.readline() num= list(map(int, l.split())) num.sort() strs=" ".join(list(map(str,num))) strs2=strs+"\n" content.append(strs2) file2=open("E:/大一/python与程序设计/file2.txt","w") file2.writelines(content) file2.close() file1.close() #(3) file1=open("E:/大一/python与程序设计/file1.txt","r") content=file1.readlines() print(len(content)) #28 from datetime import datetime as dt file3=open("E:/大一/python与程序设计/file3.txt",'r',encoding='utf-8') line1=file3.readline() content=[] for i in range(1,4): l=file3.readline().split() content.append(l) col1=[content[0][0],content[1][0],content[2][0]] col2=[content[0][1],content[1][1],content[2][1]] col3=[content[0][2],content[1][2],content[2][2]] col4=[content[0][3],content[1][3],content[2][3]] day_formate="%H:%M:%S" Time=[] Code=[] Price=[] Volume=[] for t in col1: Time.append(dt.strptime(t,day_formate)) for c in col2: Code.append(str(c)) for p in col3: Price.append(float(p)) for v in col4: Volume.append(int(v)) file3.close() #29 #(1) mean=lambda x,y,z:(x+y+z)/3 #(2) def mean(*num): if bool(num)==0: return None else: return sum(num)/len(num) #30 def fibo(n): if n==1 or n==2: return 1 else: return fibo(n-1)+fibo(n-2) #31 from math import sqrt class Point(): def __init__(self,x,y): self.x=x self.y=y class Line(Point): def __init__(self,p1,p2): self.p1=p1 self.p2=p2 def lenth(self): lenth=sqrt((self.p1.x-self.p2.x)**2+(self.p1.y-self.p2.y)**2) return lenth def slope(self): if self.p1.x==self.p2.x: return None else: k=(self.p1.y-self.p2.y)/(self.p1.x-self.p2.x) return k def __repr__(self): return ((self.p1),(self.p2)) p1=Point(2,3) p2=Point(5,9) line=Line(p1,p2) l_line=line.lenth() k_line=line.slope() print(f"起点(2,3)到止点（5，9）的线段长度为{l_line}，斜率为{k_line}") #32 class Point(): #(1) def __init__(self,x=0,y=0): self.x=x self.y=y #(2) def trans(self): return (self.y,self.x) #(3) def show(self): return print(f"该点坐标为({self.x},{self.y})") #(4) p1=Point(1,2) p1.trans() p1.show() p2=Point(3,5) p2.trans() p2.show()

对于你的代码，我进行了一些修改和注释，以便更好地理解。请查看以下代码：

# 26
# (1) 计算列表中每个元素的平方
lst = [1, 2, 3, 4, 5]
square = map(lambda x: x * x, lst)
print(list(square))

# (2) 过滤出列表中的偶数
even = filter(lambda x: x % 2 == 0, lst)
print(list(even))

# 27
# (1) 读取文件中的数字，并计算它们的总和
file1 = open("E:/大一/python与程序设计/file1.txt", "r")
content1 = file1.read()
lst1 = content1.split()
num = list(map(int, lst1))
allnum = sum(num)
print(allnum)
file1.close()

# (2) 读取文件中的数字，并将每行数字进行排序后写入新文件
file1 = open("E:/大一/python与程序设计/file1.txt", "r")
content = []
for i in range(1, 4):
l = file1.readline()
num = list(map(int, l.split()))
num.sort()
strs = " ".join(list(map(str, num)))
strs2 = strs + "\n"
content.append(strs2)
file2 = open("E:/大一/python与程序设计/file2.txt", "w")
file2.writelines(content)
file2.close()
file1.close()

# (3) 读取文件中的行数
file1 = open("E:/大一/python与程序设计/file1.txt", "r")
content = file1.readlines()
print(len(content))

# 28
# 从文件中读取数据，并按照列进行解析
from datetime import datetime as dt

file3 = open("E:/大一/python与程序设计/file3.txt", 'r', encoding='utf-8')
line1 = file3.readline()
content = []
for i in range(1, 4):
l = file3.readline().split()
content.append(l)

# 将字符串时间转换为datetime类型
col1 = [content[0][0], content[1][0], content[2][0]]
day_formate = "%H:%M:%S"
Time = [dt.strptime(t, day_formate) for t in col1]

# 将字符串转换为其他类型
col2 = [content[0][1], content[1][1], content[2][1]]
Code = [str(c) for c in col2]

col3 = [content[0][2], content[1][2], content[2][2]]
Price = [float(p) for p in col3]

col4 = [content[0][3], content[1][3], content[2][3]]
Volume = [int(v) for v in col4]

file3.close()

# 29
# (1) 求三个数的平均值
mean = lambda x, y, z: (x + y + z) / 3

# (2) 求任意数量的数的平均值
def mean(*num):
if bool(num) == 0:
return None
else:
return sum(num) / len(num)

# 30
# 计算斐波那契数列的第n项
def fibo(n):
if n == 1 or n == 2:
return 1
else:
return fibo(n - 1) + fibo(n - 2)

# 31
# 定义Point和Line类，并计算线段长度和斜率
from math import sqrt

class Point():
def __init__(self, x, y):
self.x = x
self.y = y

class Line(Point):
def __init__(self, p1, p2):
self.p1 = p1
self.p2 = p2

def length(self):
length = sqrt((self.p1.x - self.p2.x) ** 2 + (self.p1.y - self.p2.y) ** 2)
return length

def slope(self):
if self.p1.x == self.p2.x:
return None
else:
k = (self.p1.y - self.p2.y) / (self.p1.x - self.p2.x)
return k

def __repr__(self):
return ((self.p1), (self.p2))

p1 = Point(2, 3)
p2 = Point(5, 9)
line = Line(p1, p2)
l_length = line.length()
k_line = line.slope()
print(f"起点(2,3)到止点（5，9）的线段长度为{l_length}，斜率为{k_line}")

# 32
# (1) 定义一个Point类，包含x和y坐标
class Point():
def __init__(self, x=0, y=0):
self.x = x
self.y = y

# (2) 定义一个trans()函数，将坐标轴进行转换
def trans(self):
return (self.y, self.x)

# (3) 定义一个show()函数，打印出点的坐标
def show(self):
return print(f"该点坐标为({self.x},{self.y})")

p1 = Point(1, 2)
p1.trans()
p1.show()

p2 = Point(3, 5)
p2.trans()
p2.show()

将代码变为Java代码，1. 创建文件： ```python file = open("filename.txt", "w") # 打开文件，并指定写入模式 file.close() # 关闭文件 ``` 2. 写入文件： ```python file = open("filename.txt", "w") # 打开文件，并指定写入模式 file.write("Hello, World!") # 写入内容 file.close() # 关闭文件 ``` 3. 读取文件： ```python file = open("filename.txt", "r") # 打开文件，并指定读取模式 content = file.read() # 读取文件内容 print(content) # 打印文件内容 file.close() # 关闭文件 ``` ## 4.2. 文件复制和移动 文件复制和移动是常见的文件操作需求。可以使用shutil模块中的函数来执行文件复制和移动。 1. 文件复制： ```python import shutil src_file = "path/to/original_file.txt" dst_file = "path/to/new_file.txt" shutil.copy(src_file, dst_file) # 复制文件 ``` 2. 文件移动： ```python import shutil src_file = "path/to/original_file.txt" dst_dir = "path/to/destination_directory/" shutil.move(src_file, dst_dir) # 移动文件 ``` ## 4.3. 文件删除和重命名 文件删除和重命名也是常见的文件操作需求。 1. 文件删除： ```python import os file = "path/to/file.txt" os.remove(file) # 删除文件 ``` 2. 文件重命名： ```python import os src_file = "path/to/original_file.txt" dst_file = "path/to/new_file.txt" os.rename(src_file, dst_file) # 重命名文件

import java.io.File;
import java.io.FileWriter;
import java.io.FileReader;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.FileNotFoundException;

public class FileOperations {
    public static void main(String[] args) {
        createFile();
        writeFile();
        readFile();
        copyFile();
        moveFile();
        deleteFile();
        renameFile();
    }

    public static void createFile() {
        try {
            File file = new File("filename.txt");
            if (file.createNewFile()) {
                System.out.println("File created: " + file.getName());
            } else {
                System.out.println("File already exists.");
            }
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }

    public static void writeFile() {
        try {
            FileWriter writer = new FileWriter("filename.txt");
            writer.write("Hello, World!");
            writer.close();
            System.out.println("Successfully wrote to the file.");
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }

    public static void readFile() {
        try {
            BufferedReader reader = new BufferedReader(new FileReader("filename.txt"));
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }
            reader.close();
        } catch (FileNotFoundException e) {
            System.out.println("File not found.");
            e.printStackTrace();
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }

    public static void copyFile() {
        File srcFile = new File("path/to/original_file.txt");
        File destFile = new File("path/to/new_file.txt");
        
        try {
            Files.copy(srcFile.toPath(), destFile.toPath());
            System.out.println("File copied successfully.");
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }

    public static void moveFile() {
        File srcFile = new File("path/to/original_file.txt");
        File destDir = new File("path/to/destination_directory/");
        
        try {
            Files.move(srcFile.toPath(), destDir.toPath().resolve(srcFile.getName()));
            System.out.println("File moved successfully.");
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }

    public static void deleteFile() {
        File file = new File("path/to/file.txt");
        
        if (file.delete()) {
            System.out.println("File deleted: " + file.getName());
        } else {
            System.out.println("Failed to delete the file.");
        }
    }

    public static void renameFile() {
        File srcFile = new File("path/to/original_file.txt");
        File destFile = new File("path/to/new_file.txt");
        
        if (srcFile.renameTo(destFile)) {
            System.out.println("File renamed successfully.");
        } else {
            System.out.println("Failed to rename the file.");
        }
    }
}

注意：在Java中，文件复制、移动和删除操作需要使用Java的`java.nio.file.Files`类。所以，请确保在代码中导入了`java.nio.file.Files`类。