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# Join
print("and".join(["Jack", "Tom"]))
> Jack and Tom

print("and".join(["Jack", "Tom", "Jessica"]))
> Jack and Tom and Jessica

# Format
print("你和{}".Format("我"))
> 你和我

print("{}你和".Format("我"))
>我你和

当然还有 %s ，但更推荐使用 format，任何在设计到字符替换的都可使用到

with open("{}_name.txt".format(api), "a+") as f:
    f.write("{}, {}\n".format(uid["user-id"], uid.string))
    f.close()
    
string_to_sign = '{}\n{}'.format(timestamp, app_secret)

msg = "You get a new version. {}\nThe download link : {}\n".format(get_version, get_url)