# Functions
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判断文件目录是否存在.
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判断文件是否存在.
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判断字符串是否在列表中.
创建目录.
panic error.
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解析表单时间 t 表单时间字符串 hms 时分秒.
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hash 方法.
转换到大驼峰格式.
转换到下划线格式.
print usage.
生成 UUID.
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生成 int64.
验证Email格式.
# Variables
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