Python字符串输⼊输出简述
字符串输⼊
Python⽤到的输⼊⼀般有两种⽅式,input()和raw_input(),区别是,前者只能输⼊数字,后者输⼊的是字符串,使⽤如下:
In [226]: help(input)
Help on built-in function input in module __builtin__:
input(...)
python中的字符串是什么input([prompt]) -> value
Equivalent to eval(raw_input(prompt)).
In [228]: input()
d
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
<ipython-input-228-25ede6ea20bf> in <module>()
----> 1 input()
<string> in <module>()
NameError: name 'd' is not defined
In [229]: input()
23
Out[229]: 23
In [230]: input("input a num")
input a num444
Out[230]: 444
In [231]: n = input()
23
In [232]: n
Out[232]: 23
In [233]: s = raw_input("input sth.: ")
input sth.: 123
In [234]: s
Out[234]: '123'
In [235]: s = raw_input("input sth.: ")
input sth.: sss
In [236]: s
Out[236]: 'sss'
字符串输出
输出使⽤print即可,后边可加变量,也可以直接⽤"、'和'''来包含字符串,使⽤⽰例如下:
正常情况下均可以使⽤,可以使⽤⼀种包含⼀个字符串,字符串中可以包含另外⼀种(但是不可以包含同⼀种,否则需要转义)In [241]: print "i'm Tom"
i'm Tom
In [242]: print 'abc'
abc
In [243]: print "abc"
abc
In [244]: print '''abc'''
abc
In [245]: print '"hhh"'
"hhh"
In [246]: print "'hello world'"
'hello world'
In [247]: print 'i'am bt'
File "<ipython-input-247-efa01090d6c6>", line 1
print 'i'am bt'
^
SyntaxError: invalid syntax
# 字符串转义
In [248]: print 'i\'m bt'
i'm bt
In [249]: print ''' i'm tom, "hhhe"'''
i'm tom, "hhhe"
换⾏
In [250]: print ''' i
.....: am tom
.....: hhha '''
i
am tom
hhha
In [254]: print 'i am \
.
....: tom \
.....: hh'
i am tom hh
In [255]: print " i\
.....: am \n \
.....: tom \n "
iam
tom
# 此处有空⾏
# 输出⾮转义字符串
In [256]: print r"I\'m Tom"
I\'m Tom
数字字符串转换
直接使⽤str()或者int()即可,没什么可说的,如下:In [256]: print r"I\'m Tom"
I\'m Tom
In [257]: n = raw_input()
123
In [258]: n
Out[258]: '123'
In [259]: n = int(n)
In [260]: n
Out[260]: 123
In [261]: str(n)
Out[261]: '123'
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