实验任务1:
实验源码:
print(sum) sum = 42 print(sum) def inc(n): sum = n+1 print(sum) return sum sum = inc(7) + inc(7) print(sum)
实验运行截图:
答:
line1:内置函数
line3:变量名
line7:局部变量
line11:全局变量
实验任务2:
task2_1:
实验源码:
def func1(a, b, c, d, e, f): ''' 返回参数a,b,c,d,e,f构成的列表 默认,参数按位置传递; 也支持关键字传递 ''' return [a, b,c, d, e, f] def func2(a, b, c,*, d, e, f): ''' 返回参数a,b,c,d,e,f构成的列表 *后面的参数只能按关键字传递 ''' return [a,b,c,d,e,f] def func3(a, b, c, /, d, e, f): ''' 返回参数a,b,c,d,e,f构成的列表 /前面的参数只能按位置传递 ''' return [a,b,c,d,e,f] # func1调用:按位置传递、按参数传递都可以 print( func1(1,9,2,0,5,3) ) print( func1(a=1, b=9, c=2, d=0, e=5, f=3) ) print( func1(1,9,2, f=3, d=0, e=5)) # func2调用:d,e,f必须按关键字传递 print( func2(11, 99, 22, d=0, e=55, f=33) ) print( func2(a=11, b=99, c=22, d=0, e=55, f=33) ) # func3调用:a,b,c必须按位置传递 print( func3(111, 999, 222, 0, 555, 333)) print( func3(111, 999, 222, d=0, e=555, f=333) )
实验运行截图:
在最后一行加上print( func2(11, 99, 22, 0, 55, 33) )
实验运行截图:
错误原因:fun2中 d,e,f要用关键字参数输入
在最后一行加上print(func3(a=111, b=999, c=222, 0, 555, 333) )
错误原因:fun3中a,b,c只能按位置传递
task2_2:
实验源码:
list1 = [1, 9, 8, 4] print( sorted(list1) ) print( sorted(list1, reverse=True) ) print( sorted(list1, True) )
实验运行截图:
task2_3:
实验源码:
1 def func(a, b, c, /, *, d, e, f): 2 return( [a,b,c,d,e,f] ) 3 4 print(func(1, 2, 3, d=4, e=5, f=6))
实验运行截图:
实验任务3:
实验源码:
def solve(a, b, c): ''' 求解一元二次方程, 返回方程的两个根 :para: a,b,c: float 方程系数 :return: tuple ''' delta = b*b - 4*a*c delta_sqrt = abs(delta)**0.5 p1 = -b/2/a p2 = delta_sqrt/2/a if delta >= 0: root1 = p1 + p2 root2 = p1 - p2 else: root1 = complex(p1, p2) root2 = complex(p1, -p2) return root1, root2 while True: try: t = input('输入一元二次方程系数a b c, 或者,输入#结束: ') if t == '#': print('结束计算,退出') break a, b, c = map(float, t.split()) if a == 0: raise ValueError('a = 0, 不是一元二次方程') except ValueError as e: print(repr(e)) print() except: print('有其它错误发生\n') else: root1, root2 = solve(a, b, c) print(f'root1 = {root1:.2f}, root2 = {root2:.2f}') print()
实验运行截图:
在line23前面增加一行代码:print(solve.__doc__)
实验源码:
def solve(a, b, c): ''' 求解一元二次方程, 返回方程的两个根 :para: a,b,c: float 方程系数 :return: tuple ''' delta = b*b - 4*a*c delta_sqrt = abs(delta)**0.5 p1 = -b/2/a p2 = delta_sqrt/2/a if delta >= 0: root1 = p1 + p2 root2 = p1 - p2 else: root1 = complex(p1, p2) root2 = complex(p1, -p2) return root1, root2 print(solve.__doc__) while True: try: t = input('输入一元二次方程系数a b c, 或者,输入#结束: ') if t == '#': print('结束计算,退出') break a, b, c = map(float, t.split()) if a == 0: raise ValueError('a = 0, 不是一元二次方程') except ValueError as e: print(repr(e)) print() except: print('有其它错误发生\n') else: root1, root2 = solve(a, b, c) print(f'root1 = {root1:.2f}, root2 = {root2:.2f}') print()
实验运行截图:
line3-5被打印出来
实验任务4:
实验源码:
# list_generator()函数定义 def list_generator(x,y,s=1): l = [] while x<=y: l.append(x) x = x+s return l list1 = list_generator(-5, 5) print(list1) list2 = list_generator(-5, 5, 2) print(list2) list3 = list_generator(1, 5, 0.5) print(list3)
实验运行截图:
实验任务5:
实验源码:
def is_prime(n): if n < 2: return False else: for i in range(2, n): if n % i == 0: return False else: return True prime = [] for i in range(2, 21): if is_prime(i): prime.append(i) else: continue for j in range(2, 21, 2): for a in prime: if (j-a) in prime and a <= (j-a): print(f'{j} = {a} + {j-a}') else: continue
实验运行截图:
实验任务6:
实验源码:
def encoder(x1): x2 = '' for i in x1: if i.isalpha(): if 65 <= ord(i) <= 85 or 97 <= ord(i) <= 117: i = chr(ord(i)+5) x2 += i elif ord(i) > 85 or ord(i) > 117: i = chr(ord(i)+5-26) x2 += i else: x2 += i return x2 def decoder(y1): y2 = '' for j in y1: if j.isalpha(): if 65 <= ord(j) <= 69 or 97 <= ord(j) <= 101: j = chr(ord(j)+26-5) y2 += j elif ord(j) > 69 or ord(j) > 101: j = chr(ord(j)-5) y2 += j else: y2 += j return y2 text = input('输入英文文本: ') encoded_text = encoder(text) print('编码后的文本: ', encoded_text) decoded_text = decoder(encoded_text) print('对编码后的文本解码: ', decoded_text)
实验运行截图:
实验任务7:
实验源码:
def collatz(n): lst = [n] while lst[-1] != 1: if lst[-1] % 2 == 0: lst.append(lst[-1]//2) else: lst.append(lst[-1]*3+1) return lst try: n = int(input('Enter a positive integer:')) if n <= 0: raise except: print('Error: must be a positive integer') else: print(collatz(n))
实验运行截图:
实验任务8:
实验源码:
def func(n): if n == 0: result = 1 for i in range(n): result *= 2 return result-1 while True: x = input() if x == '#': print('计算结束') break n = int(x) ans = func(n) print(f'n = {n}, ans = {ans}')
实验运行截图:
标签:return,函数,编程,实验,print,root1,def,root2 From: https://www.cnblogs.com/juiceup26/p/17415657.html