python3 print函数的用法

1. 输出字符串

>>> strHello = ‘Hello World‘ 

>>> print (strHello)

Hello World

支持参数格式化，与C语言的printf类似

>>> strHello = "the length of (%s) is %d" %(‘Hello World‘,len(‘Hello World‘))

>>> print (strHello)
the length of (Hello World) is 11

#%x --- hex 十六进制
#%d --- dec 十进制
#%o --- oct 八进制
 
>>> nHex = 0xFF
>>> print("nHex = %x,nDec = %d,nOct = %o" %(nHex,nHex,nHex))
nHex = ff,nDec = 255,nOct = 377

import math
>>> print(‘PI=%f‘%math.pi)
PI=3.141593
>>> print ("PI = %10.3f" % math.pi)

PI =      3.142
>>> print ("PI = %-10.3f" % math.pi)

PI = 3.142     
>>> print ("PI = %06d" % int(math.pi))
PI = 000003

5. 格式化输出浮点数(float) 

>>> precise = 3
>>> print ("%.3s " % ("python"))
pyt

>>> precise = 4
>>> print ("%.*s" % (4,"python"))
pyth

>>> print ("%10.3s " % ("python"))
       pyt

>>> lst = [1,2,3,4,‘python‘]
>>> print (lst)
[1, 2, 3, 4, ‘python‘]

print 会自动在行末加上回车,如果不需回车，只需在print语句的结尾添加一个逗号”,“，就可以改变它的行为。

>>> for i in range(0,6):
    print (i,)

    
0
1
2
3
4
5

或直接使用下面的函数进行输出：

>>> import sys
>>> sys.stdout.write(‘Hello World‘)
Hello World