Python基础练习100题 ( 21~ 30）

摘要：刷题继续昨天和大家分享了前道题，今天继续来刷解法一解法一解法二解法三解法一解法二解法一解法一解法二解法一解法二解法一解法二解法一解法二解法一解法二解法一源代码下载这十道题的代码在我的上，如果大家想看一下每道题的输出结果，可以点击

昨天和大家分享了前10道题，今天继续来刷21~30

A robot moves in a plane starting from the original point (0,0). The robot can move toward UP, DOWN, LEFT and RIGHT with a given steps. The trace of robot movement is shown as the following:

UP 5
DOWN 3
LEFT 3
RIGHT 2

The numbers after the direction are steps. Please write a program to compute the distance from current position after a sequence of movement and original point. If the distance is a float, then just print the nearest integer.
Example:
If the following tuples are given as input to the program:

UP 5
DOWN 3
LEFT 3
RIGHT 2

Then, the output of the program should be:

2

import  math

x,y = 0,0
while True:
    s = input().split()
    if not s:
        break
    if s[0]=="UP":                  # s[0] indicates command
        x-=int(s[1])                # s[1] indicates unit of move
    if s[0]=="DOWN":
        x+=int(s[1])
    if s[0]=="LEFT":
        y-=int(s[1])
    if s[0]=="RIGHT":
        y+=int(s[1])
                                    # N**P means N^P
dist = round(math.sqrt(x**2 + y**2))  # euclidean distance = square root of (x^2+y^2) and rounding it to nearest integer
print(dist)

Write a program to compute the frequency of the words from the input. The output should output after sorting the key alphanumerically.
Suppose the following input is supplied to the program:

New to Python or choosing between Python 2 and Python 3? Read Python 2 or Python 3.

Then, the output should be:

2:2
3.:1
3?:1
New:1
Python:5
Read:1
and:1
between:1
choosing:1
or:2
to:1

ss = input().split()
word = sorted(set(ss))     # split words are stored and sorted as a set

for i in word:
    print("{0}:{1}".format(i,ss.count(i)))

ss = input().split()
dict = {}
for i in ss:
    i = dict.setdefault(i,ss.count(i))   

dict = sorted(dict.items())            
                                         
for i in dict:
    print("%s:%d"%(i[0],i[1]))

from collections import Counter

ss = input().split()
ss = Counter(ss)         # returns key & frequency as a dictionary
ss = sorted(ss.items())  # returns as a tuple list

for i in ss:
    print("%s:%d"%(i[0],i[1]))

Write a method which can calculate square value of number

def square(num):
    return num ** 2

print(square(2))
print(square(3))

n=int(input())
print(n**2)

Python has many built-in functions, and if you do not know how to use it, you can read document online or find some books. But Python has a built-in document function for every built-in functions.
Please write a program to print some Python built-in functions documents, such as abs(), int(), raw_input()
And add document for your own function

print (abs.__doc__)
print (int.__doc__)

def square(num):
    """
 Return the square value of the input number.
 The input number must be integer.
 """
    return num ** 2

print (square(2))
print (square.__doc__)

Define a class, which have a class parameter and have a same instance parameter.

class Car:
    name = "Car"

    def __init__(self,name = None):
        self.name = name

honda=Car("Honda")
print("%s name is %s"%(Car.name,honda.name))

toyota=Car()
toyota.name="Toyota"
print("%s name is %s"%(Car.name,toyota.name))

class Person:
    # Define the class parameter "name"
    name = "Person"
    
    def __init__(self, name = None):
        # self.name is the instance parameter
        self.name = name

jeffrey = Person("Jeffrey")
print ("{0} name is {1}".format(Person.name, jeffrey.name))

nico = Person()
nico.name = "Nico"
print (f"{Person.name} name is {nico.name}")

Define a function which can compute the sum of two numbers.

sum = lambda n1,n2 : n1 + n2      # here lambda is use to define little function as sum
print(sum(1,2))

def SumFunction(number1, number2):
    return number1 + number2

print SumFunction(1,2)

Define a function that can convert a integer into a string and print it in console.

def printValue(n):
    print (str(n))

printValue(3)

conv = lambda x : str(x)
n = conv(10)
print(n)
print(type(n))  

Define a function that can receive two integer numbers in string form and compute their sum and then print it in console.

def printValue(s1,s2):
    print int(s1) + int(s2)
printValue("3","4") #7

sum = lambda s1,s2 : int(s1) + int(s2)
print(sum("10","45"))      # 55

Define a function that can accept two strings as input and concatenate them and then print it in console.

def printValue(s1,s2):
    print s1 + s2

printValue("3","4") #34

sum = lambda s1,s2 : s1 + s2
print(sum("10","45"))        # 1045

Define a function that can accept two strings as input and print the string with maximum length in console. If two strings have the same length, then the function should print all strings line by line.

def printVal(s1,s2):
    len1 = len(s1)
    len2 = len(s2)
    if len1 > len2:
        print(s1)
    elif len1 < len2:
        print(s2)
    else:
        print(s1)
        print(s2)

s1,s2=input().split()
printVal(s1,s2)

这十道题的代码在我的github上，如果大家想看一下每道题的输出结果，可以点击以下链接下载：

Python 21-30题

我的运行环境Python 3.6+,如果你用的是Python 2.7版本，绝大多数不同就体现在以下3点：

raw_input()在Python3中是input()

print需要加括号

fstring可以换成.format(),或者%s，%d

谢谢大家，我们下期见！希望各位朋友不要吝啬，把每道题的更高效的解法写在评论里，我们一起进步！！！