Python 3学习笔记

>>> print("""\
a
b
c\
""")
a
b
c
>>> 'a' * 3
'aaa'
>>> 'b' 'a'
'ba'
>>> 'b' + "a"
'ba'
>>> "abcde"[1:]
'bcde'
>>> "abcde"[:4]
'abcd'
>>> "abcde"[:]
'abcde'
>>> "abcde"[-3:]
'cde'

>>> [1,2,3][1:]
[2, 3]
>>> [1,2,3][-2:]
[2, 3]
>>> a = [1,2,3,4]
>>> a[2:] = [4,5,6]
>>> a
[1, 2, 4, 5, 6]
>>> a[2:] = []
>>> a
[1, 2]

>>> for n in range(2, 10):
    for x in range(2, n):
        if n % x == 0:
            print(n, 'equals', x, '*', n//x)
            break
    else:
        print(n, 'is a prime number')

        
2 is a prime number
3 is a prime number
4 equals 2 * 2
5 is a prime number
6 equals 2 * 3
7 is a prime number
8 equals 2 * 4
9 equals 3 * 3