Python3中的输出语句:
函数原型如下:
print(help(print)) 使用此语句打印
print(...)
print(value, ..., sep=' ', end='\n', file=sys.stdout, flush=False)
Prints the values to a stream, or to sys.stdout by default.
Optional keyword arguments:
file: a file-like object (stream); defaults to the current sys.stdout.
sep: string inserted between values, default a space.
end: string appended after the last value, default a newline.
flush: whether to forcibly flush the stream.
分隔符:
a = 'hello'
b = 'Python'
c = 'ixusy88'
# 默认空格
print('1----',a,b,c)
# 指定分割符
print('2----',a,b,c,sep='!')
print('3----',a,b,c,sep=',')
"""
输出结果:
1---- hello Python ixusy88
2----!hello!Python!ixusy88
3----,hello,Python,ixusy88
"""
end:
a = 'hello'
b = 'Python'
c = 'ixusy88'
# end 默认是新的一行,即下一个打印会在新的一行输出
print('1----',a,b,c)
# 指定结束符,
print('2----',a,b,c,end='###')
print('3----',a,b,c)
print('4----',a,b,c)
"""
结果:
1---- hello Python ixusy88
2---- hello Python ixusy88###3---- hello Python ixusy88
4---- hello Python ixusy88
"""
输出流:
a = 'hello'
b = 'Python'
c = 'ixusy88'
# file ,默认是sys.stdout
print('1----',a,b,c)
# file,指定输出流,输出到文件中
print('2----',a,b,c,file=open('test.txt','w'))
print('-1--')
# 读取文件,并打印出来
print(open('test.txt').read() )
print('-2--')
# 也可以修改sys.stdout,把定向到一个文件,之后的所有输出都会保存到文件中;
import sys
print('sys.stdout之后')
sys.stdout = open('test_2.txt','w')
print('1----',a,b,c)
print(sys.platform)
"""
输出结果:
1---- hello Python ixusy88
-1--
2---- hello Python ixusy88
-2--
sys.stdout之后
"""
输出文件中的内容