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场景：在写接口用例时，入参有时不能重复，如手机号码，身份证号等等。这时需要用到随机字符串或者随机数字当做入参
1.生成随机数字
${phoneNumber} Evaluate random.randint(13775570000,13775579999) random
2.生成随机字符串
#${str} evaluate string.ascii_letters string
${str} evaluate string.ascii_lowercase string
log ${str}
${len} evaluate len('${str}')
log ${len}
${num} set variable 10
${name} set variable ${empty}
: FOR ${index} IN RANGE ${num}
\ ${i} evaluate random.randint(0,int(${len})-1) random
\ ${tmp} set variable ${str[int(${i})-1]}
\ ${newStr} set variable ${name}${tmp}
log ${name}