Python[十一]:Format

Format>>>for x in range(1,11): print(repr(x).rjust(2),repr(x*x).rjust(3),end=' ') print(repr(x*x*x).rjust(4)) 1 1 1 2 4 8 3 9 27 4 16 64 5 25 125 6 36 216 7 49 343 8 64 512 9 81 72910 100 1000>>> for x in range(1,11): print('{0:2d} {1:3d} {2:4d}'.format(x,x*x,x*x*x)) 1 1 1 2 4 8 3 9 27 4 16 64 5 25 125 6 36 216 7 49 343 8 64 512 9 81 72910 100 1000>>> x=1212121.>>> x1212121.0>>> x.ljust(2)[:2]Traceback (most recent call last): File "<pyshell#9>", line 1, in <module> x.ljust(2)[:2]AttributeError: 'float' object has no attribute 'ljust'>>> repr(x).ljust(2)[:2]'12'>>> '12'.zfill(5)'00012'>>> '-3.14'.zfill(7)'-003.14'>>> print('We are the {0} who say "{1}!"'.format('knights','Ni'))We are the knights who say "Ni!">>> print('{0} and {1}'.format('spam','eggs'))spam and eggs>>> print('{1} and {0}'.format('spam','eggs'))eggs and spam>>> print('This is {index} name: {name}'.fomat(index=56,name='ICT'))Traceback (most recent call last): File "<pyshell#16>", line 1, in <module> print('This is {index} name: {name}'.fomat(index=56,name='ICT'))AttributeError: 'str' object has no attribute 'fomat'>>> print('This is {index} name: {name}'.format(index=56,name='ICT'))This is 56 name: ICT>>> import math>>> print('The value of PI is approximately {0:.3f}'.format(math.pi))The value of PI is approximately 3.142>>> The value of PI is approximately 3.142SyntaxError: invalid syntax (<pyshell#20>, line 1)>>> table={'Sjored':4127,'Jack':4098,'Dcab':7678}>>> for name,phone in table.items(): print('{0:10} ==> {1:10d}'.format(name,phone)) Dcab ==> 7678Sjored ==> 4127Jack ==> 4098>>> table{'Dcab': 7678, 'Sjored': 4127, 'Jack': 4098}>>> print('Jack:{0[Jack]:d};Sjored:{0[Sjored]:d};')Jack:{0[Jack]:d};Sjored:{0[Sjored]:d};>>> print('Jack:{0[Jack]:d};Sjored:{0[Sjored]:d};Dcab:{0[Dcab]:d}'.format(table))Jack:4098;Sjored:4127;Dcab:7678>>> table{'Dcab': 7678, 'Sjored': 4127, 'Jack': 4098}>>> print('Jack:{Jack:d};Sjored:{Sjored:d};Dcab:{Dcab:d}'.format(**table))Jack:4098;Sjored:4127;Dcab:7678>>> import math>>> print('The value of PI is approximately %5.3f.'%math.pi)The value of PI is approximately 3.142.