with open('D:/myproject/python/a1234.txt') as f:
print(f.readlines())
with open('D://myproject//python//a1234.txt') as f:
print(f.readlines())
with open('D:\\myproject\\python\\a1234.txt') as f:
print(f.readlines())
with open('D:/myproject/python/a1234.txt') as f:
print(f.readlines())
with open('D://myproject//python//a1234.txt') as f:
print(f.readlines())
with open('D:\\myproject\\python\\a1234.txt') as f:
print(f.readlines())