1.plaincode=input('明文:')
print('密文:',end='')
for i in plaincode:
print(chr(ord(i)+3),end="")
2.
print('国家名称 GDP总量(人民币亿元)')
print('{0:''<12}¥{1:' '>10,.2f}'.format('中国',765873.4375))
print('{0:''<10}¥{1:' '>10,.2f}'.format('澳大利亚',78312.4375))
3.
for x in range(1,10):
for y in range(1,x+1):
print('{0:''<1}*{1:''<1}={2:''<3}'.format(y,x,x*y),end='')
print('\n')