Python's Process Control-for dictionary

First, create a dictionary:

In [17]: dic={}In [18]: dic.fromkeys(‘abcde‘,100)Out[18]: {‘a‘: 100, ‘b‘: 100, ‘c‘: 100, ‘d‘: 100, ‘e‘: 100}

Use the For loop to traverse the K value of the dictionary:

In [21]: for k in dict1:   ....:     print(k)   ....:     acbed

Use the For loop to traverse the K value of the dictionary and print out the K and values values:

In [22]: for k in dict1:    print(k),dict1[k]   ....:     a 100c 100b 100e 100d 100

After you have formatted the output and after you have finished beautifying:

In [23]: for k in dict1:    print("%s : %s" % (k,dict1[k]))   ....:     a : 100c : 100b : 100e : 100d : 100

We can also use items to output a dictionary as a list:

In [24]: dict1.itdict1.items       dict1.iteritems   dict1.iterkeys    dict1.itervalues  In [24]: dict1.items()Out[24]: [(‘a‘, 100), (‘c‘, 100), (‘b‘, 100), (‘e‘, 100), (‘d‘, 100)]

Use the For loop to iterate through this list:

In [25]: for i in dict1.items():print i(‘a‘, 100)(‘c‘, 100)(‘b‘, 100)(‘e‘, 100)(‘d‘, 100)

You can also specify two variables to receive a value:

In [27]: for i,v in dict1.items():print i,va 100c 100b 100e 100d 100

Directly to the dictionary access, without any method, the traversal is the dictionary K value:

In [29]: for i in dict1:print i            acbed

If you want to output values, you can still take the same value as before:

In [30]: for i in dict1:print i,dict1[i]a 100c 100b 100e 100d 100

As a child, we can write the multiplication formula by Python, the code is as follows:

#!usr/local/python3/bin/pythonfor i in range(1,10):      #指定有多少列    for j in range(1,i+1):      #嵌套指定有多少行，#        print("%s * %s = %s" % (j,i,j*i),end=‘   ‘)        print("{0} * {1} = {2}".format(j,i,j*i),end=‘   ‘)                        #格式化输出，当前循环结束之前以空格分割    print("\n")     #循环结束重新进入下一个循环的时候进行换行

The final results are as follows:

[email protected] ~]# python nine.py

1 * 1 = 1   1 * 2 = 2   2 * 2 = 4   1 * 3 = 3   2 * 3 = 6   3 * 3 = 9   1 * 4 = 4   2 * 4 = 8   3 * 4 = 12   4 * 4 = 16   1 * 5 = 5   2 * 5 = 10   3 * 5 = 15   4 * 5 = 20   5 * 5 = 25   1 * 6 = 6   2 * 6 = 12   3 * 6 = 18   4 * 6 = 24   5 * 6 = 30   6 * 6 = 36   1 * 7 = 7   2 * 7 = 14   3 * 7 = 21   4 * 7 = 28   5 * 7 = 35   6 * 7 = 42   7 * 7 = 49   1 * 8 = 8   2 * 8 = 16   3 * 8 = 24   4 * 8 = 32   5 * 8 = 40   6 * 8 = 48   7 * 8 = 56   8 * 8 = 64   1 * 9 = 9   2 * 9 = 18   3 * 9 = 27   4 * 9 = 36   5 * 9 = 45   6 * 9 = 54   7 * 9 = 63   8 * 9 = 72   9 * 9 = 81

Python's Process Control-for dictionary