如何在Python中同时打开多个文件？

file1 = open("file1.txt", "r")
file2 = open("file2.txt", "r")
# 读取文件内容或进行其他操作
file1.close()
file2.close()

with open("file1.txt", "r") as file1, open("file2.txt", "r") as file2:
    # 读取文件内容或进行其他操作

filenames = ["file1.txt", "file2.txt", "file3.txt"]
files = []
for filename in filenames:
    file = open(filename, "r")
    files.append(file)

# 对每个文件进行操作
for file in files:
    # 读取文件内容或进行其他操作
    file.close()