中括号的含义

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#1 Created at ... [Delete] [Delete and Lock User]

server.sendmail(from_addr, [to_addr], msg.as_string()) 这句代码中 [to_addr]为什么要加中括号？

#2 Created at ... [Delete] [Delete and Lock User]

addrs = [to_addr]
server.sendmail(from_addr, addrs, msg.as_string())