Len (), range () function

The Len () function returns the length of a string, a list, a dictionary, a tuple, and so on

EG1: Calculates the length of the string:

>>>s= ' Hello good boy Doiido '

>>>len (s)

>>>21

EG2: Count the number of elements in the list:

name=[' Zhu ', ' Han ', ' shi '] >>>l=[' h ', ' e ', ' l ', ' l ', ' O ']

AGE=[21,22,23] >>>len (l)

For I in range (len (name)): 5

Print Name[i], ' is ', age[i], ' years '

Output:

Zhu is yaer old

Han is-yaer old

Shi is at Yaer old

EG3: Calculates the total length of the Dictionary: (calculates the total number of key-value pairs)

d={' x ': 1, ' Y ': 2, ' Z ': 3}

Len (d)

3

EG4: Calculating the number of tuple elements

t= (' g ', ' o ', ' o ', ' d ')

Len (t)

4

Range () function:

Eg1:range (1,5) #从1到5 (not including 5)

[1,2,3,4,5]

Eg2:range (1,5,2) #从1到5, Interval 2 (not including 5)

[1,3]

Eg3:range (5) #从0到5 (not including 5)

[0,1,2,3,4]

Operation of List:

array=[1,2,5,3,6,8,4]

#array的顺序标志是:

(0,1,2,3,4,5,6)

( -7,-6,-5,-4,-,-2,-1)

Then: >>>array[0:] #列出0以后得

[1,2,5,3,6,8,4]

>>>array[1:] #列出1以后得

[2,5,3,6,8,4]

>>>ARRAY[:-1] #列出-1 ago

[1,2,5,3,6,8]

>>>array[3:-3] #列出3到-3

[3]

Len (), range () function