Detailed introduction to Python string input and output

String input

There are generally two methods of input used in Python, input() and raw_input(). The difference is that the former can only be input Numbers, the latter input is a string, use the following:

In [226]: help(input)

Help on built-in function input in module __builtin__:

input(...)
    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'

String output

Use print for output, you can add variables after it, or you can use it directly ", ' and ''' to include strings. Examples of use are as follows:

• can be used under normal circumstances. You can use one to contain a string, and the string can contain another One type (but it cannot contain the same type, otherwise it needs to be escaped)

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"

• Line break

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

numeric characters For string conversion

just use str() or int(). There is nothing to say, as follows:

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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