Python List-generated

When we're going to generate the list, we can use the range function:

>>> Range (1,5) range (1, 5)

In the 3.0 version, the range is only used to generate an iterator (xrange is replaced).

But in the 2.0 version, we can use range to quickly generate a list

>>> Range (1, one) [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

>>> L = [] for in range (1,11):    * x)    >>> l[ 1, 4, 9, 16, 25, 36, 49, 64, 81, 100]

The above code is a list that we generate

 for  in range (1,11) [1, 4, 9, 16, 25, 36, 49, 64, 81, 100]

But in the code below we use this fast list generator to save code.

Like a slice , our range function has more than two incoming values and can have three incoming values :

Print  for  in range (1,10,2)] [2, 12, 30, 56, 90]

The third pass-in value is the specified value of every two

In the List Builder, we can also append an if condition clause to the back.

def touppers (L):     return  for inch if isinstance (X,STR)] Print (Touppers (['hello','World', 101])) [ ' HELLO ' '  World ']

Isinstance (X,STR) can be used to determine if this is a string.

Upper () can be used to return uppercase letters.

For loops can be nested , so in a list build, you can also use a multi-layer for loop to generate the list.

Print  for inch  for inch  for inch if m*100+n*10+z = = z*100+n*10+m]) [101, 111, 121, 131, 141, 151, 161, 171, 181, 191, 202, 212, 222, 232, 242, 252, 262, 272, 282, 292, 303, 313, 323, 333, 343, 353, 363, 373, 383, 393, 404, 414, 424, 434, 444, 454, 464, 474, 48  4, 494, 505, 515, 525, 535, 545, 555, 565, 575, 585, 595, 606, 616, 626, 636, 646, 656, 666, 676, 686, 696, 707, 717, 727, 737, 747, 757, 767, 777, 787, 797, 808, 818, 828, 838, 848, 858, 868, 878, 888, 898, 909, 919, 929, 939, 949, 959, 969, 9 79, 989, 999]

Python List-generated