Python values and strings

Python data type

1. Value--type: 1/integral type

2/Long Integer type

3/Float Type--0.0, 12.0, -18.8, 3e+7, etc.

4/plural type--complex

In [10x34alout[1842L--0x34a -- indicates 16 binary --l   -- Represents a long integer type

In [2]: 4e+7out[240000000.0in[3]: type (4e+7  ) out[3float--Scientific counting method

in [4]: B ="Hello\nlulu"In [6]: bout[6]:'Hello\nlulu'In [7]: Print Bhellolulu--it has a newline character and prints it out in the [8]: a =" "Hello...: Lulu" "In [9]: aout[9]:'Hello\nlulu'In [Ten]: Print Ahellolulu---Triple quotes-can be double quotes or single quotes-table interpretation so that you can automatically load line multibyte, do not need to write their own

2. String--is a sequence--the operation of the sequence can be indexed and sliced

in [7]: B ='OPLKDJ'In [8]: bout[8]:'OPLKDJ'In [Ten]: b[0]out[Ten]:'o'In [ One]: b[4]out[ One]:'D'In [ A]: b[-1]out[ A]:'J'In [ -]: b[-3]out[ -]:'k'==========================/*Take two characters*/In [ -]: b[0]+b[4]out[ -]:'od'In [ the]: b[0:3]                --starting from the No. 0, Fetch 3, the third does not show out[ the]:'OPL'

in [2]: a ='ABCDE'In [3]: aout[3]:'ABCDE'In [4]: a[1:2]out[4]:'b'In [5]: a[:]out[5]:'ABCDE'In [6]: a[:-1]out[6]:'ABCD'--0 to the last one, but not the last in [7]: a[:2]out[7]:'AB'--[:2] The default colon to the left is 0In [8]: a[-1]out[8]:'e'In [9]: a[1:] out[9]:'BCDE'--from number 1th to the last

in [Ten]: a[:-1]out[Ten]:'ABCD'In [ One]: a[::-1]out[ One]:'EDCBA'In [ A]: a[::1]out[ A]:'ABCDE'In [ -]: a[::2]out[ -]:'Ace'In [ -]: a[::]out[ -]:'ABCDE'

3. List

4. Tuples

5. Dictionaries

Python values and strings