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题目:创建一个链表。
0 r7 [3 U, f2 x! N% a程序分析:原文不太靠谱。8 N2 f, `# Y1 r) ?! |9 y
- class Node:$ T& ?+ T2 G5 c0 ]5 z
6 C$ C! w3 {: c, K, e2 p- def __init__(self, data):
6 e, \+ @% ^8 Z( R' l - self.data = data `0 s* q1 q+ O* b2 t2 s
- self.next = None' K; ?) @2 V; M6 h$ a
9 K+ M9 M6 ~7 x' n- def get_data(self):6 z, I$ R* @4 J" I: a2 M2 ~* S% B8 j
- return self.data
# ?/ B3 L S6 N" c8 S - & N! P+ R4 `* E% v) a
- class List:
\; `7 q8 O, {# t% d0 ^# I - 9 D/ a2 G8 B4 S& W* G
- def __init__(self, head):, [. X0 h5 ?9 s# P
- self.head = head
' ~; F( @/ `; A8 l( ~
7 A4 o# p' J3 ]0 C# x2 F4 ~- def is_empty(self):
; K7 ]! U# J+ u - return self.get_len() == 0
. S; S. a% F3 \+ \/ R# H
6 ]" J/ n+ f# F5 R$ o- T* b1 [7 `- def get_len(self):
/ c# ]% M8 S6 c5 Y' T% X: g' J - length = 0' G* R* S% u5 T$ `
- temp = self.head y) W# f. p0 m+ q3 b4 ]
- while temp is not None:! j+ [+ R' V; w: i
- length += 1: _2 m, w& A$ W# s
- temp = temp.next
9 j' Y% o3 |9 @( V1 H7 x3 _% @ - return length
+ L5 A7 \! ^( E0 z
6 O3 `9 C# D/ V+ T- def append(self, node):
/ v/ @ \9 [( { - temp = self.head! n3 N7 ]- r% P u
- while temp.next is not None:
3 v3 B" P! r+ y- o, y8 l5 J- q - temp = temp.next+ w7 M$ }" v2 \9 O) Y
- temp.next = node, [6 e1 f6 @( L6 Y. m5 L
- 5 s6 x; X( z7 N5 t w
- def delete(self, index): & C- L+ G: z9 r
- if index < 1 or index > self.get_len():7 q/ A. x4 I9 f2 g4 y# \; a% W7 D
- print("给定位置不合理")
9 B! v! j, ~& |! G" |& D. J, j8 ? - return. ~' T: y6 }9 T3 |+ N
- if index == 1:
% x: D0 l( C2 J* S" E3 e/ K* r - self.head = self.head.next, f. ]/ C3 w2 g5 U
- return6 W, [7 K, s n' T6 y
- temp = self.head! Y+ `; ]8 R4 V2 Z
- cur_pos = 0
3 T: t8 q+ B0 H" V; E* S: _ - while temp is not None:
* u3 A- W3 v0 ] @7 O - cur_pos += 1
. m) ?" m1 B0 `' z- f3 G6 { - if cur_pos == index-1:! {% i2 ^0 d) N* q ^& L: w b" F
- temp.next = temp.next.next: {, v& F4 [1 x" m8 G! g
- temp = temp.next
: Z' d$ e2 d6 b( b- N - ' X7 I9 `+ W, G! [- H
- def insert(self, pos, node):- P7 U0 I T3 }. l6 K
- if pos < 1 or pos > self.get_len():- ]9 V) L2 E \2 ~$ Q0 Z
- print("插入结点位置不合理")
1 ], s4 v( _* V- [, I/ x( I2 d9 i8 S - return' X4 F# Q: n0 E |
- temp = self.head2 \0 p5 d* J X" v; m
- cur_pos = 0
$ ~3 l* B* L0 H3 W6 [ - while temp is not Node:
+ H7 E! ] c% ` I' R( A$ m - cur_pos += 1$ |7 O8 U: H, C
- if cur_pos == pos-1:# O, g' w+ l* g* u. z/ j M
- node.next = temp.next
' F% y% Z: C$ p! \( Y8 R4 r7 p - temp.next =node
& E3 }, r) K2 Y, ~. k. n6 m4 [ - break) P% D. i5 d7 `9 C
- temp = temp.next
) ^$ x! g6 o8 J! I0 `! t
5 n. l- U& z- |0 i3 h+ a* U- def reverse(self, head):; B) W# K0 q5 ]1 j h6 J P3 s
- if head is None and head.next is None:
9 i* f2 l- V3 [( C' i+ i - return head
7 H" e8 Z5 y. O s+ n9 b% r - pre = head
9 N2 u* I( S$ d3 D: B7 C( U - cur = head.next n; l7 g+ t8 |4 F2 H- E
- while cur is not None:, f/ C G( k3 J9 v1 M6 O# c
- temp = cur.next
% H6 v' w: [7 M - cur.next = pre
2 {' y1 Z" n- o% X. @( T/ H - pre = cur
; q' U2 z; d5 i4 ] - cur = temp8 E: f# A* E# T, G7 s
- head.next = None& | I l; `# o% ^; |6 J
- return pre
( m7 Z3 G9 E) y& e y7 c6 y. p- r
4 z q' P; s( l# G/ G( @- def print_list(self, head):+ Z! _! b2 O3 Y( J* L+ K
- init_data = []$ a# k; |, b! z: T% T2 l7 n4 C* h( f
- while head is not None:
" K/ M- m) x) p# A$ r - init_data.append(head.get_data())
3 a4 ^# l% T* h& ] - head = head.next/ h+ k' I7 ?: n Q
- return init_data |* S. w: Q) l! G
- " ]8 q& X8 q8 F. Z! y0 h
- if __name__=='__main__':
0 y9 b) M' Z2 S' L - head=Node('head')- x( j/ g( s$ }% Z0 X
- link=List(head)3 L3 `7 L2 I, H* I$ ~# \9 L
- for i in range(10):% B4 T0 z( N/ C
- node=Node(i)* {. z7 ]$ r6 Z+ x4 a# |, v7 t
- link.append(node)
( _- j# ?- W7 D0 g - print(link.print_list(head))
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