python學習手冊13:while及for迴圈

天飛.h發表於2016-02-16
PythonWhile

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  1. #!/usr/bin/env python
  2. # –*– coding:utf8 –*–
  3. # Import python libs
  4. from __future__ import print_function
  6. for x in [“spam”, “eggs”, “ham”]:
  7.     print(x, end=`
    `    )
  9. sum=0
  10. for x in [1,2,3,4]:
  11.     sum +=x
  12. print(sum)
  13. prod=1
  14. for item in [1,2,3,4]:
  15.     prod*=item
  16. print(prod)
  17. #for迴圈應用於字串，元組
  18. S=`asdfafafdag[4qqqfqf`
  19. T=(“a”,“b”,“c”)
  20. for x in S:
  21.     print(x,end=`,`)
  23. for y in T:
  24.     print(y,end=`_`)
  26. Y=((1,2),(3,4),(5,6))
  27. for (a,b) in Y:
  28.     print (a,b)
  30. D={`a`:1,`b`:2,`c`:3}
  31. print(list(D.items()))
  32. L=list(D.items())
  33. print(L)
  34. for (key,value) in D.items():
  35.     print(key, `=>`, value)
  36. ((a,b),c) = ((1,2),3)
  37. print(a,b,c)
  38. for ((a,b),c) in [((1,2),3),((4,5),6)]:
  39.     print(a,b,c)
  40. all = (1,2,3,4)
  41. #a,*b,c=(1,2,3,4)
  42. a,b,c=all[0],all[1:3],all[3]
  43. print(a,b,c)
  46. items=[`aaa`,111,(4,5),2.01]
  47. tests=[(4,5),3.14]
  48. for key in tests:
  49.     for item in items:
  50.         if key == item:
  51.             print(key,`was found.`)
  52.             break
  53.     else:
  54.         print(key,`was not found.`)
  55. for key in tests:
  56.     if key in items:
  57.         print(key,`was found.`)
  58.     else:
  59.         print(key,`was not found.`)
  60. seq1=`adfklo2`
  61. seq2=`aqwerl2`
  62. res=[]
  63. for x in seq1:
  64.     if x in seq2:
  65.         res.append(x)
  66. print(res)
  67. print(range(5))
  68. print(range(2,100,2))
  69. print(range(10,–5,–1))
  70. print(range(–5,5,2))
  71. for i in range(–10,50,2):
  72.     print(i,`:line`)
  73. X=`fghjkl;`
  74. for i in range(len(X)):
  75.     print(X[i],end=`,`)
  76. for i in X:
  77.     print(i,end=`.`)
  78. print(`================`)
  79. Y=`asdfghjklwertyuiodfghjkertyu`
  80. for i in range(0,len(Y),3):
  81.     print(Y[i],`;`)
  82. print(Y[::4])
  83. Z=[1,2,3,4,5]
  84. for i in range(len(Z)):
  85.     Z[i]+=1
  86. print(Z)
  87. A=[10,20,30,40,50]
  88. B=[1,2,3,4]
  89. print(zip(A,B))
  90. for (i,j) in zip(A,B):
  91.     print(i,`+`,j,`=`,i+j)
  93. C=[`ADF`,`WER`,`HKL`]
  94. D=[1,2,3]
  95. E={}
  96. for k,v in zip(C,D):
  97.     E[k]=v
  98. print(E)
  99. E=dict(zip(C,D))
  100. print(E)
  101. #產生偏移和元素：enumerate
  102. S=`asdfghjkl`
  103. for offset,item in enumerate(S):
  104.     print(item,`appears at offset`,offset)
  105. “`
  106. a appears at offset 0
  107. s appears at offset 1
  108. d appears at offset 2
  109. f appears at offset 3
  110. g appears at offset 4
  111. h appears at offset 5
  112. j appears at offset 6
  113. k appears at offset 7
  114. l appears at offset 8
  115. `“
  116. #依次取出
  117. E=enumerate(S)
  118. print(next(E))
  119. print(next(E))
  120. print(next(E))
  121. print(next(E))
  122. print(next(E))
  123. print(next(E))
  124. print(next(E))
  125. print(next(E))
  126. print(next(E))
  127. “`
  128. (0, `a`)
  129. (1, `s`)
  130. (2, `d`)
  131. (3, `f`)
  132. (4, `g`)
  133. (5, `h`)
  134. (6, `j`)
  135. (7, `k`)
  136. (8, `l`)
  137. `“
  138. #生成與偏移的相對應的個數的元素
  139. print([a * b for a,b in enumerate(S)])
  140. “`
  141. [``, `s`, `dd`, `fff`, `gggg`, `hhhhh`, `jjjjjj`, `kkkkkkk`, `llllllll`]
  142. `“


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