Python用到的輸入一般有兩種方式,input()
和raw_input()
,差別是,前者只能輸入數字,後者輸入的是字串,使用如下:
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'
輸出使用print
即可,後邊可加變量,也可以直接用"、'和'''來包含字串,使用範例如下:
正常情況下均可使用,可以使用一種包含一個字串,字串中可以包含另外一種(但是不可以包含同一種,否則需要轉義)
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"
#換行
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
str()或
int()即可,沒什麼好說的,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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