You are given a valid XML document, and you have to print its score. The score is calculated by the sum of the score of each element. For any element, the score is equal to the number of attributes it ...

但凡树木都会通过光合作用将太阳能转化为化学能，同时释放人类生存所需的氧气，但你见过集设备充电、Wi-Fi、供水、照明等等功能于一体的太阳能树吗？在法国中部的讷韦尔市（Nevers）就出现了这样一种太阳树 eTree，在提供清洁能源的同时还提高了人们的 ...

PEP 616, string methods to remove prefixes and suffixes. New features in the standard library: PEP 593, flexible function and variable annotations;:func:`os.pidfd_open` added that allows process ...