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题目:创建一个链表。
+ h+ [) A1 | @- J) `程序分析:原文不太靠谱。
O4 P- f6 t- k; [: P- class Node:9 W: h- T* j7 L! m9 U( J. q6 W
/ S) W" R' z" \7 b, C8 r6 N6 v- def __init__(self, data):
! B$ E' {6 \% R# h! t - self.data = data) K& T* [- `" `' o8 x$ [
- self.next = None
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! _% d0 _: F3 n2 U& m& T- def get_data(self):
8 y2 S: E* Y0 r( l0 N; Z% ]) g - return self.data
: c5 o$ d- Y3 I$ _+ V. I1 ~& n
4 K1 ~# I6 B. ?0 }- class List:
* Y* n& D3 K; c - + Z I: X) F5 e5 p0 C5 l/ R
- def __init__(self, head):
# G/ U3 k* j* z - self.head = head2 l; q! e: J+ s. Y# c8 ^
- , Z" P" m0 h- R9 P9 s
- def is_empty(self): 9 f0 r1 {- Z+ ] I. [5 B$ R
- return self.get_len() == 0
3 d+ I+ C, s; W8 U$ M' D - # R8 n' k% m5 c0 o
- def get_len(self):
4 x' ]- k; l& q3 R( r8 ^ - length = 0
+ m7 N, \2 @3 K& d- c1 } - temp = self.head
% T3 A; Y& H" @' L" ^, X5 l6 h - while temp is not None:5 ^- w6 T' d! Q
- length += 1
c) s# t/ R! p5 g; P8 c5 h; k - temp = temp.next6 z" r, K( X; u: B
- return length: E' ]8 p" t# o2 p
- 1 s, u( H" R" v- l4 |& O' `/ I
- def append(self, node):
6 H- C. A: w$ }4 |+ x- T+ ?' D A - temp = self.head
2 F& k! y6 f$ E+ a - while temp.next is not None:
6 O9 y! j1 G0 D2 |, n- s - temp = temp.next M' o, L B, M( a# k: Y, |; X4 x
- temp.next = node# x0 |3 ? Y" {5 [6 s
- , ~+ W0 x- x2 F5 c7 _
- def delete(self, index): 2 K( d8 q4 \; n& j7 x+ H7 w% A1 x Z
- if index < 1 or index > self.get_len():
1 K; r; ]& A5 k. n0 C7 C - print("给定位置不合理")- e+ J% k8 `8 Q: |5 B7 ^* Y
- return# @+ G) |0 R( A' Y2 e! x! {
- if index == 1:% g+ H! Z* n/ |! b0 Z% a
- self.head = self.head.next+ C: h) ^9 p9 H( p' K
- return
! N( b% e4 k% P f - temp = self.head1 A- A0 e8 @* ?, h2 Y
- cur_pos = 0
4 Y% C* { D! [3 [+ b/ c) T6 h6 G - while temp is not None:5 V9 x6 G K+ a- I h L! R+ p
- cur_pos += 1
& p8 r6 _% S2 j G - if cur_pos == index-1:3 u0 L% s4 ~& g0 h1 l; V6 A+ P) r
- temp.next = temp.next.next7 }$ w0 Y- m" Z! q" L
- temp = temp.next
) K4 q/ U# T% a* {; R
. C- ~( h) C0 L$ G1 L" q% n6 H1 S- def insert(self, pos, node):
B1 } _0 Q! V8 d2 h/ q# h - if pos < 1 or pos > self.get_len():4 p# j, F; ?+ B
- print("插入结点位置不合理")8 Y- l4 W% i1 y, p8 C2 c
- return
+ k* T8 N" y3 c) m! g( s' R* _ - temp = self.head p. ?# X5 R( j) W
- cur_pos = 0
~7 j" {5 }/ e* L - while temp is not Node:
" O5 _" M V$ h9 h C9 e! S& k - cur_pos += 1+ b7 k# U! t0 p% n/ z
- if cur_pos == pos-1:0 a$ ~, Y! J7 Z
- node.next = temp.next" c, a- x( J. A; F
- temp.next =node
- u) R9 ^ X1 j6 g7 O2 ]8 [ - break
3 E; j' |1 K: j' ?" H7 b - temp = temp.next3 O* B& e. }4 q2 r
' s$ l2 E' V. h3 _# Y- def reverse(self, head):
/ w( M! |- I9 C- }' E1 u - if head is None and head.next is None:
% C2 i6 k9 r3 y) t- v - return head! E, ^- a' b9 j6 j7 c& W
- pre = head7 r1 \ n8 a2 M5 }5 |8 M/ A
- cur = head.next1 V. |' s- s3 ]$ y
- while cur is not None:* [- w0 R: @+ W6 V5 B
- temp = cur.next" ?0 X; F9 ~, P- b
- cur.next = pre$ g0 X# w! [, s% R1 ^$ T
- pre = cur
, S" d9 T) S: w# D, i - cur = temp; n7 z' g. H/ S& m
- head.next = None
9 b3 i! V8 v4 g9 A - return pre
* r/ D% @, O6 E A4 N
! n7 y% P' W& I- def print_list(self, head):8 {2 @" _( Q0 |( w
- init_data = [], S$ N# Z# f2 \" O9 U: B
- while head is not None:1 }+ r6 ]4 \: Y7 o( |9 J9 ]0 U
- init_data.append(head.get_data()): ]4 k4 k3 ~, g
- head = head.next9 T9 b, w1 [/ K% D/ o$ q
- return init_data
! y' N- X& P# |* Z& S" i# Z$ v2 R - 1 ~+ H. O8 V) I9 L, l* ?3 F2 H
- if __name__=='__main__':
5 a! R1 Q2 m) ~; w6 j5 y - head=Node('head')6 k& O; g( w9 v; e" b- P. ^' A
- link=List(head)' z4 o+ K: g0 W4 ?
- for i in range(10):: q; v( e* {$ j; v
- node=Node(i), `( ]6 q) z! F3 z) X; c
- link.append(node)$ m7 u. Z* \* W& R" v
- print(link.print_list(head))
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