第一次使用：字符串操作
In [1]: lst=[11,12,13,7,1,3,2,2,5,6,10,7]
In [2]: lst
Out[2]: [11, 12, 13, 7, 1, 3, 2, 2, 5, 6, 10, 7]
In [3]: lst1=[11,12,13,7,1,3,2,2,5,6,10,7]
In [4]: lst1
Out[4]: [11, 12, 13, 7, 1, 3, 2, 2, 5, 6, 10, 7]
In [5]: lst1.pop()
Out[5]: 7
In [6]: lst1.reverse()
In [7]: lst1
Out[7]: [10, 6, 5, 2, 2, 3, 1, 7, 13, 12, 11]
In [8]: lst.sort()
In [9]: lst
Out[9]: [1, 2, 2, 3, 5, 6, 7, 7, 10, 11, 12, 13]
In [11]: lst
Out[11]: [1, 2, 2, 3, 5, 6, 7, 7, 10, 11, 12, 13]
In [12]: lst.sort(reverse=True)
In [13]: lst
Out[13]: [13, 12, 11, 10, 7, 7, 6, 5, 3, 2, 2, 1]
In [14]: lst.sort(key=str)
In [15]: lst
Out[15]: [1, 10, 11, 12, 13, 2, 2, 3, 5, 6, 7, 7]
In [16]: lst.append('a')
In [17]: lst
Out[17]: [1, 10, 11, 12, 13, 2, 2, 3, 5, 6, 7, 7, 'a']
In [18]: lst.sort(key=str)
In [19]: lst
Out[19]: [1, 10, 11, 12, 13, 2, 2, 3, 5, 6, 7, 7, 'a']
In [20]: lst.sort(key=str,reverse=True)
In [21]: lst
Out[21]: ['a', 7, 7, 6, 5, 3, 2, 2, 13, 12, 11, 10, 1]
In [23]: lst
Out[23]: ['a', 7, 7, 6, 5, 3, 2, 2, 13, 12, 11, 10, 1]
In [24]: 3 in lst
Out[24]: True
In [25]: 'a' in lst
Out[25]: True
In [26]: if 30 in lst:
...: pass
Out[26]: ''
In [27]: for x in lst:
...: print(x)
In [28]: lst
Out[28]: ['a', 7, 7, 6, 5, 3, 2, 2, 13, 12, 11, 10, 1]
In [30]: if 7 in lst:
...: print('qq')
...:
qq
In [31]: for x in [1,2,3]:
...: print(x)
...:
1
2
3
In [32]: lst0=list(range(4))
In [33]: id(lst0)
Out[33]: 1193702777928
In [35]: hash(id(lst0))
Out[35]: 1193702777928
In [36]: lst1=list(range(4))
In [37]: id(lst1)
Out[37]: 1193702003144
In [38]: lst0==lst1
Out[38]: True
In [39]: hash((1,2))
Out[39]: 3713081631934410656
In [40]: lst1=lst0
In [41]: lst1[2]=10
In [42]: lst1
Out[42]: [0, 1, 10, 3]
In [43]: lst0
Out[43]: [0, 1, 10, 3]
In [44]: lst0[3]=12
In [45]: lst0
Out[45]: [0, 1, 10, 12]
In [46]: lst1
Out[46]: [0, 1, 10, 12]
In [47]: lst0=list(range(4))
In [48]: lst0
Out[48]: [0, 1, 2, 3]
In [49]: lst5=lst0.copy()
In [50]: lst5
Out[50]: [0, 1, 2, 3]
In [51]: lst5==lst0
Out[51]: True
In [52]: lst0=[1,[2,3,4],5]
In [53]: lst5=lst0.copy()
In [54]: lst5==lst0
Out[54]: True
In [55]: lst5[2]=10
In [56]: lst5==lst0
Out[56]: False
In [57]: lst5
Out[57]: [1, [2, 3, 4], 10]
In [58]: lst0
Out[58]: [1, [2, 3, 4], 5]
In [59]: lst5[2]=5
In [60]: lst5==lst0
Out[60]: True
In [61]: lst5[1][1]=20
In [62]: lst5==lst0
Out[62]: True
In [63]: t=tuple()
In [64]: t
Out[64]: ()
In [65]: t=()
In [66]: t
Out[66]: ()
In [67]: t=tuple(range(1,7,2))
In [68]: t
Out[68]: (1, 3, 5)
In [69]: t=(2,4,4,[1,2,3],2,5)
In [70]: t
Out[70]: (2, 4, 4, [1, 2, 3], 2, 5)
In [71]: t[3][0]=6
In [72]: t
Out[72]: (2, 4, 4, [6, 2, 3], 2, 5)
In [73]: t=(1,)
In [74]: t
Out[74]: (1,)
In [75]: t=(1,)*5
In [76]: t
Out[76]: (1, 1, 1, 1, 1)
In [77]: t=(1,2,3)*6
In [78]: t
Out[78]: (1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3)
In [79]: t=tuple(range(1,7,2))
In [80]: t
Out[80]: (1, 3, 5)
In [81]: for i in t:
...: print(i)
...:
1
3
5
In [83]: from collections import namedtuple
In [84]: Point=namedtuple('_Point',['x','y'])
In [85]: p=Point(11,22)
In [86]: p
Out[86]: _Point(x=11, y=22)
In [87]: Student=namedtuple('Student','name age')
In [88]: tom=Student('tom',20)
In [89]: jerry=Student('jerry',18)
In [90]: tom.name
Out[90]: 'tom'
In [91]: jerry.age
Out[91]: 18
In [92]: s1='string'
In [93]: s1
Out[93]: 'string'
In [94]: s2="string2"
In [95]: s2
Out[95]: 'string2'
In [96]: s3='''this's a "string" '''
In [97]: s3
Out[97]: 'this\'s a "string" '
In [98]: s4='hello \n magedu.com'
In [99]: s4
Out[99]: 'hello \n magedu.com'
In [100]: s5=r"hello \n magedu.com"
In [101]: s5
Out[101]: 'hello \\n magedu.com'
In [102]: s6='c:\windows\nt'
In [103]: s6
Out[103]: 'c:\\windows\nt'
In [104]: s7=R"c:\windows\nt"
In [105]: s7
Out[105]: 'c:\\windows\\nt'
In [106]: s8='c:\windows\\nt'
In [107]: s8
Out[107]: 'c:\\windows\\nt'
In [108]: sql="""select * from user where name='tom'"""
In [109]: sql
Out[109]: "select * from user where name='tom'"
In [110]:
=============================
In [1]: lst=['1','2','3']
In [4]: lst
Out[4]: ['1', '2', '3']
In [5]: s1="I'm \ta super student."
In [6]: s1
Out[6]: "I'm \ta super student."
In [7]: s1.split()
Out[7]: ["I'm", 'a', 'super', 'student.']
In [8]: s1.split('s')
Out[8]: ["I'm \ta ", 'uper ', 'tudent.']
In [9]: s1.split('super')
Out[9]: ["I'm \ta ", ' student.']
In [10]: s1.split('super ')
Out[10]: ["I'm \ta ", 'student.']
In [11]: s1.split(' ')
Out[11]: ["I'm", '\ta', 'super', 'student.']
In [12]: s1.split(' ',maxsplit=2)
Out[12]: ["I'm", '\ta', 'super student.']
In [13]: s1.split('\t',maxsplit=2)
Out[13]: ["I'm ", 'a super student.']
In [14]: s1.partition('s')
Out[14]: ("I'm \ta ", 's', 'uper student.')
In [15]: s1.partition('stu')
Out[15]: ("I'm \ta super ", 'stu', 'dent.')
In [17]: s1.partition('abc')
Out[17]: ("I'm \ta super student.", '', '')
In [18]: s2='abc'
In [19]: s2.center(30)
Out[19]: ' abc '
In [20]: s2.center(30,'=')
Out[20]: '=============abc=============='
In [21]: s2.zfill(30)
Out[21]: '000000000000000000000000000abc'
In [22]: s="\r \n \t Hello Python \n \t"
In [23]: s.strip()
Out[23]: 'Hello Python'
In [24]: s3="I am very very sorry"
In [25]: s3.strip("Iy")
Out[25]: ' am very very sorr'
In [26]: s3.strip("Iy ")
Out[26]: 'am very very sorr'
In [27]: s
Out[27]: '\r \n \t Hello Python \n \t'
In [28]: print(s)
Hello Python
In [29]: s3
Out[29]: 'I am very very sorry'
In [30]: s3.find('very')
Out[30]: 5
In [31]: s.find('very',5)
Out[31]: -1
In [32]: s3.find('very',5)
Out[32]: 5
In [33]: s3.find('very',6,13)
Out[33]: -1
TypeError: 'str' object is not callable
In [35]: s3[-1]
Out[35]: 'y'
In [36]: s3.rfind('very',10)
Out[36]: 10
In [37]: s3.rfind('very',10,15)
Out[37]: 10
In [38]: s3.rfind('very',-10,-1)
Out[38]: 10
In [39]: '{0}*{1}={2:<2}'.format(3,2,2*3)
Out[39]: '3*2=6 '
In [40]: '{0}*{1}={2:<2}'.format(3,2,2*3)
...:
Out[40]: '3*2=6 '
In [41]: '{0:.2f}'.format(1/3)
Out[41]: '0.33'
In [42]: '1{0:b}'.format(10) #二进制
Out[42]: '11010'
IIn [43]:
In [43]: '1{0:b}'.format(16)
Out[43]: '110000'
In [44]: '{0:0}'.format(10) #八进制
Out[44]: '10'
In [45]: '{0: 0}'.format(10) #八进制
Out[45]: ' 10'
In [46]: '{0:o}'.format(10) #八进制
Out[46]: '12'
In [47]: '{0:x}'.format(10) #16进制
Out[47]: 'a'
In [48]: '{:,}'.format(12369132698) #千分位格式化
Out[48]: '12,369,132,698'
In [50]: name='World'
In [54]: name='World'
In [55]: 'Hello {}'.format(name)
Out[55]: 'Hello World'
In [56]: coord=(3,5)
In [57]: 'X:{0[0]};Y:{0[1]}'.format(coord)
Out[57]: 'X:3;Y:5'
In [58]: "repr() shows quotes: {!r}; str() doesn't: {!s}".format('test1', 'test2')
Out[58]: "repr() shows quotes: 'test1'; str() doesn't: test2"
In [59]: '{:<30}'.format('left aligned')
Out[59]: 'left aligned '
In [60]: '{:>30}'.format('right aligned')
Out[60]: ' right aligned'
In [61]: '{:^30}'.format('centered')
Out[61]: ' centered '
In [62]: '{:*^30}'.format('centered') # use '*' as a fill char
Out[62]: '***********centered***********'
In [63]: dir(1-3j)
Out[63]:
['__abs__','__add__',
....
'__truediv__',
'conjugate',
'imag',
'real']
In [64]: ('The complex number {0} is formed from the real part {0.real} '
...: 'and the imaginary part {0.imag}.').format(1-2j)
Out[64]: 'The complex number (1-2j) is formed from the real part 1.0 and the imaginary part -2.0.'
In [65]: class Point:
...: def __init__(self,x,y):
...: self.x,self.y=x,y
...: def __str__(self):
...: return 'Point({self.x},{self.y})'.format(self=self)
...:
...: str(Point(5,4))
...:
...:
Out[65]: 'Point(5,4)'
In [66]: '{:,}'.format(1234567890)
Out[66]: '1,234,567,890'
In [67]: a=18
In [68]: b=22
In [69]: '{:.2%}'.format(a/b)
Out[69]: '81.82%'
In [70]: import datetime
In [71]: d=datetime.datetime(2010,7,4,12,15,35)
In [72]: '{:%Y-%m-%d %H:%M:%S}'.format(d)
Out[72]: '2010-07-04 12:15:35'
In [73]: width=5
In [74]: for num in range(5,12):
...: for base in 'dXob': #分别是10/16/8/2进制
...: print('{0:{width}{base}}'.format(num,base=base,width=width),end=' ')
...: print()
...:
5 5 5 101
6 6 6 110
7 7 7 111
8 8 10 1000
9 9 11 1001
10 A 12 1010
11 B 13 1011
In [75]:
D:\djangoPro\sample\1>git clone [email protected]:lindezhi/python-fundamentals-.git
Cloning into 'python-fundamentals-'...
remote: Enumerating objects: 81, done.
remote: Total 81 (delta 0), reused 0 (delta 0), pack-reused 81R
Receiving objects: 100% (81/81), 181.61 KiB | 743.00 KiB/s, done.
D:\djangoPro\sample\1>git clone [email protected]:fans180/python-basic-learning.git
Cloning into 'python-basic-learning'...
remote: Enumerating objects: 77, done.
remote: Counting objects: 100% (29/29), done.
remote: Compressing objects: 100% (29/29), done.
remote: Total 77 (delta 7), reused 0 (delta 0), pack-reused 48
Receiving objects: 100% (77/77), 35.41 KiB | 659.00 KiB/s, done.
Resolving deltas: 100% (9/9), done.
D:\djangoPro\sample\1>git clone [email protected]:xiaoguangding/python-base.git
Cloning into 'python-base'...
remote: Enumerating objects: 595, done.
remote: Counting objects: 100% (468/468), done.
remote: Compressing objects: 100% (449/449), done.
^Cceiving objects: 6% (37/595), 186.26 MiB | 1.16 MiB/s
D:\djangoPro\sample\1>git clone [email protected]:AnonyEast/python.git
Cloning into 'python'...
remote: Enumerating objects: 458, done.
remote: Counting objects: 100% (321/321), done.
remote: Compressing objects: 100% (291/291), done.
Receiving objects: 91% (417/458), 10.42 MiB | 1005.00 KiB/s 37 eceiving objects: 90% (413/458), 10.42 MiB | 1005.00 KiB/s
Receiving objects: 100% (458/458), 10.75 MiB | 1.08 MiB/s, done.
Resolving deltas: 100% (126/126), done.
D:\djangoPro\sample\1>git clone [email protected]:huiyuandev/python-fundamentals.git
Cloning into 'python-fundamentals'...
remote: Enumerating objects: 24, done.
remote: Counting objects: 100% (24/24), done.
remote: Compressing objects: 100% (23/23), done.
remote: Total 24 (delta 2), reused 0 (delta 0), pack-reused 0
Receiving objects: 100% (24/24), 4.03 KiB | 589.00 KiB/s, done.
Resolving deltas: 100% (2/2), done.
D:\djangoPro\sample\1>git clone [email protected]:shuai222/python-basic-learning.git
Cloning into 'python-basic-learning'...
remote: Enumerating objects: 1894, done.
remote: Total 1894 (delta 0), reused 0 (delta 0), pack-reused 1894
Receiving objects: 100% (1894/1894), 72.20 MiB | 1.14 MiB/s, done.
Resolving deltas: 100% (137/137), done.
Checking out files: 100% (288/288), done.
D:\djangoPro\sample\1>git clone [email protected]:nzp_dany/python.git
Cloning into 'python'...
remote: Enumerating objects: 4, done.
remote: Total 4 (delta 0), reused 0 (delta 0), pack-reused 4
Receiving objects: 100% (4/4), done.
D:\djangoPro\sample\1>ipython
Python 3.7.0 (default, Jun 28 2018, 08:04:48) [MSC v.1912 64 bit (AMD64)]
Type 'copyright', 'credits' or 'license' for more information
IPython 6.5.0 -- An enhanced Interactive Python. Type '?' for help.
In [1]: bytes(range(100))
Out[1]: b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !
"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abc'
In [2]: len(bytes(range(100)))
Out[2]: 100
In [3]: bytes(range(500))
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-3-f32657ac3240> in <module>()
----> 1 bytes(range(500))
ValueError: bytes must be in range(0, 256)
In [4]: bytes('abv','utf8')
Out[4]: b'abv'
In [5]: bytes('你好','utf8')
Out[5]: b'\xe4\xbd\xa0\xe5\xa5\xbd'
InIn [6]: ''
Out[6]: ''
In [7]: '你好'.encode()
Out[7]: b'\xe4\xbd\xa0\xe5\xa5\xbd'
In [8]: a='acd'.encode()
In [9]: a
Out[9]: b'acd'
In [10]: a.decode()
Out[10]: 'acd'
In [11]: b=bytes(a)
In [12]: b==a
Out[12]: True
In [14]: id(b)==id(a)
Out[14]: True
In [15]: id(b) is id(a)
Out[15]: False
In [16]: b
Out[16]: b'acd'
In [17]: a
Out[17]: b'acd'
In [18]: b.split(b'c')
Out[18]: [b'a', b'd']
In [19]: bytes.fromhex('6162 09 6a 6b00')
Out[19]: b'ab\tjk\x00'
In [20]: 'abc'.encode().hex()
Out[20]: '616263'
In [21]: b'abcde'[2]
Out[21]: 99
In [22]: ret=bytearray('abcd'.encode())
In [23]: ret
Out[23]: bytearray(b'abcd')
In [26]: ?a
Type: bytes
String form: b'acd'
Length: 3
Docstring:
bytes(iterable_of_ints) -> bytes
bytes(string, encoding[, errors]) -> bytes
bytes(bytes_or_buffer) -> immutable copy of bytes_or_buffer
bytes(int) -> bytes object of size given by the parameter initialized with null bytes
In [27]: abs?
Signature: abs(x, /)
Docstring: Return the absolute value of the argument.
Type: builtin_function_or_method
In [28]: _a
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
<ipython-input-28-04695a6e8c46> in <module>()
----> 1 _a
NameError: name '_a' is not defined
In [29]: -a
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-29-bd5f19dddee1> in <module>()
----> 1 -a
TypeError: bad operand type for unary -: 'bytes'
In [30]: q=3
In [31]: _
Out[31]: bytearray(b'abcd')
In [32]: __
Out[32]: bytearray(b'abcd')
In [33]: ___
Out[33]: bytearray(b'abcd')
In [34]: _dh
Out[34]: ['D:\\djangoPro\\sample\\1']
In [35]: _oh
Out[35]:
{1: b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !"#$%
&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abc',
2: 100,
4: b'abv',
5: b'\xe4\xbd\xa0\xe5\xa5\xbd',
6: '',
7: b'\xe4\xbd\xa0\xe5\xa5\xbd',
9: b'acd',
10: 'acd',
12: True,
14: True,
15: False,
16: b'acd',
17: b'acd',
18: [b'a', b'd'],
19: b'ab\tjk\x00',
20: '616263',
21: 99,
23: bytearray(b'abcd'),
31: bytearray(b'abcd'),
32: bytearray(b'abcd'),
33: bytearray(b'abcd'),
34: ['D:\\djangoPro\\sample\\1']}
In [36]:
第二次：
标签：...,12,10,笔记,lst,done,Ipyton,1003,Out From： https://www.cnblogs.com/mengdie1978/p/16750917.html