Python初学者之路----字符串的简单操作和time库的简单引用

import time
start=time.perf_counter()

dayname='星期一星期二星期三星期四星期五星期六星期日'
num=eval(input('输入数字（1-7）:'))
pos=(num-1)*3
print(dayname[pos:pos+3])

weekStr='一二三四五六日'
print('星期'+weekStr[num-1])

for i in range(12):
    print(chr(9800+i),end='')
 
print('\n')
example='I want a big boat I'
print(example.upper())
print(example.split(',')) #返回列表
print(example.replace('I','you'))
print(example.center(20,'='))
print(example.count('b'))
exa='pythonpdp'
print(exa.center(21,'='))

print(exa.strip('p'))   #只能去掉两侧
print(','.join(exa))    #返回字符串 每一个元素后加‘，’


print('{0:,.2f}'.format(123456.456))
print('今天是{1}，时间是{0}，我叫{2}'.format('17 47','2020 4 1','文添圣'))
print('{0:+^20}'.format('afddd'))
# {序号：格式}

print(time.time())
print(time.ctime())
print(time.gmtime())

end=time.perf_counter()