有人能告诉我如何在python中读取该文件吗？

# 打开文件
file = open('filename.txt', 'r')

# 读取文件内容
content = file.read()

# 关闭文件
file.close()

# 打印文件内容
print(content)

# 打开文件
file = open('filename.txt', 'r')

# 逐行读取文件内容
lines = file.readlines()

# 关闭文件
file.close()

# 打印文件内容
for line in lines:
    print(line)

with open('filename.txt', 'r') as file:
    content = file.read()
    print(content)