for ... in ... can identify the list of dictionary string range () function range () does not recognize the integer floating point
range: a list of integers
range (x) function, can generate a sequence of integers from 0 to x-1 of
Using the range (a, b) function, you can generate a sequence of integers {} takes the head of the tail is not taken.
When you want a piece of code is fixed repeated n times, it can be used directly for i in range (n), the code is repeated n times.
range (0,10,3) means: a number from 0 to 9 (not take take the first tail), the interval number is 3
range (a, b, c) a list of integers, is not considered a tail head B, interval c
for ... in ... the dictionary
for ... in ... the print key
Print value for ... in ...
while loop
After indentation [while] is the clause will be executed cyclically
Note that some single quotes
