1.输出 "Hello, World!"：
print("Hello, World!")
2.求两个数的和：
a = 5
b = 7
c = a + b
print(c)
3.计算圆的面积：
import math
radius = 4
area = math.pi * radius ** 2
print(area)
4.判断一个数是否为偶数：
num = 8
if num % 2 == 0:
print("This number is even.")
else:
print("This number is odd.")
5.计算一个列表的平均值：
lst = [1, 2, 3, 4, 5]
avg = sum(lst) / len(lst)
print(avg)
6.打印九九乘法表：
for i in range(1, 10):
for j in range(1, i+1):
print(f"{j}x{i}={i*j}", end='\t')
print()
7.判断一个字符串是否为回文字符串：
s = "racecar"
if s == s[::-1]:
print("This is a palindrome.")
else:
print("This is not a palindrome.")
· 5.
8.输出斐波那契数列的前20项：
a, b = 0, 1
for i in range(20):
print(a, end=' ')
a, b = b, a+b
9.生成一个包含10个随机数的列表：
import random
lst = []
for i in range(10):
lst.append(random.randint(1, 100))
print(lst)
10.将一个字符串中的大写字母转换为小写字母：
s = "HelLo, WoRLd!"
s_lower = s.lower()
print(s_lower)
11.将一个字符串中的小写字母转换为大写字母：
s = "HelLo, WoRLd!"
s_upper = s.upper()
print(s_upper)
12.将一个列表中的元素按照从小到大的顺序排列：
lst = [5, 3, 8, 2, 7, 4, 1, 9, 6]
lst.sort()
print(lst)
13.判断一个数是否为质数：
num = 17
if num > 1:
for i in range(2, int(num/2)+1):
if (num % i) == 0:
print(num, "is not a prime number")
break
else:
print(num, "is a prime number")
else:
print(num, "is not a prime number")
14.求一个列表中的最大值和最小值：
lst = [5, 3, 8, 2, 7, 4, 1, 9, 6]
max_val = max(lst)
min_val = min(lst)
print("Max value:", max_val)
print("Min value:", min_val)
15.将一个字符串翻转：
string = "Hello, World!"
reversed_string = string[::-1]
print(reversed_string)
16.判断一个数是否为完全平方数：
num = 16
if (num**0.5).is_integer():
print(num, "is a perfect square.")
else:
print(num, "is not a perfect square.")
17.计算一个字符串中包含的字母个数：
s = "Hello, World!"
count = 0
for c in s:
if c.isalpha():
count += 1
print(count)
18.计算一个数的阶乘：
num = 5
factorial = 1
for i in range(1, num+1):
factorial *= i
print(factorial)
19.将一个列表中的元素去重：
lst = [1, 2, 3, 2, 4, 5, 4, 6, 7, 6]
unique_lst = list(set(lst))
print(unique_lst)
20.将一个列表中的元素随机排序：
import random
lst = [1, 2, 3, 4, 5, 6, 7, 8, 9]
random.shuffle(lst)
print(lst)
21.将一个列表中的元素逆序排列：
lst = [1, 2, 3, 4, 5, 6, 7, 8, 9]
lst.reverse()
print(lst)
22.一个字符串中的单词按照字典序排序：
s = "this is a test string"
words = s.split()
words.sort()
sorted_s = ' '.join(words)
print(sorted_s)
23.计算两个数的最大公约数：
a = 15
b = 25
while b != 0:
t = b
b = a % b
a = t
print("The greatest common divisor is:", a)
24.计算两个数的最小公倍数：
a = 15
b = 25
gcd = 0
for i in range(1, b+1):
if (a * i) % b == 0:
gcd = a * i
break
print("The least common multiple is:", gcd)
25.将一个字符串中的空格替换为下划线：
s = "Hello, World!"
s_underscore = s.replace(' ', '_')
print(s_underscore)
26.判断一个数是否为回文数：
num = 12321
if str(num) == str(num)[::-1]:
print(num, "is a palindrome.")
else:
print(num, "is not a palindrome.")
27.判断一个字符串是否为全数字：
s = "12345"
if s.isdigit():
print(s, "consists entirely of digits.")
else:
print(s, "does not consist entirely of digits.")
28.计算一个数的平方根：
import math
num = 16
sqrt = math.sqrt(num)
print(sqrt)
29.将一个列表中的元素按照长度从小到大排序：
my_list = ["apple", "banana", "cherry", "date", "elderberry"]
sorted_list = sorted(my_list, key=len)
print(sorted_list)
30.将一个列表中的元素按照长度从大到小排序：
lst = ["apple", "banana", "pear", "orange", "kiwi"]
lst.sort(key=len, reverse=True)
print(lst)
31.将一个字符串中的每个单词首字母大写：
s = "this is a test string"
words = s.split()
capitalized_words = [word.capitalize() for word in words]
capitalized_s = ' '.join(capitalized_words)
print(capitalized_s)
32.计算一个数的立方：
num = 5
cube = num ** 3
print(cube)
33.计算一个数的四次方：
num = 5
fourth_power = num ** 4
print(fourth_power)
34.将一个列表中的元素用逗号连接成一个字符串：
lst = ["apple", "banana", "pear", "orange", "kiwi"]
s = ', '.join(lst)
print(s)
35.将一个列表中的元素用空格连接成一个字符串：
lst = ["apple", "banana", "pear", "orange", "kiwi"]
s = ' '.join(lst)
print(s)
36.将一个列表中的元素用换行符连接成一个字符串：
lst = ["apple", "banana", "pear", "orange", "kiwi"]
s = '\n'.join(lst)
print(s)
37.判断一个数是否为质数：
num = 17
is_prime = True
if num > 1:
for i in range(2, int(num**0.5)+1):
if num % i == 0:
is_prime = False
break
else:
is_prime = False
if is_prime:
print(num, "is a prime number.")
else:
print(num, "is not a prime number.")
38.将一个字符串中的字母大小写互换：
s = "Hello, World!"
swap_s = s.swapcase()
print(swap_s)
39.判断一个字符串是否为回文字符串：
s = "racecar"
if s == s[::-1]:
print(s, "is a palindrome.")
else:
print(s, "is not a palindrome.")
40.计算两个数的和、差、积和商：
a = 5
b = 3
sum = a + b
difference = a - b
product = a * b
quotient = a / b
print("The sum is:", sum)
print("The difference is:", difference)
print("The product is:", product)
print("The quotient is:", quotient)
41.判断一个字符串中是否包含另一个字符串：
s = "Hello, World!"
sub_s = "World"
if sub_s in s:
print(s, "contains", sub_s)
else:
print(s, "does not contain", sub_s)
42.将一个字符串中的数字取出来并求和：
s = "There are 7 apples and 3 oranges."
nums = [int(i) for i in s.split() if i.isdigit()]
sum_nums = sum(nums)
print(sum_nums)
43.将一个列表中的元素按照字符串长度排序，并按照长度相同的元素字典序排序：
lst = ["pear", "banana", "kiwi", "apple", "orange"]
lst.sort(key=lambda x: (len(x), x))
print(lst)
44.计算一个数的平方根：
import math
num = 9
sqrt_num = math.sqrt(num)
print(sqrt_num)
45.将一个列表中的元素去重：
lst = [1, 2, 3, 2, 4, 3, 5, 6, 1]
unique_lst = list(set(lst))
print(unique_lst)
46.将一个字符串中的每个单词逆序输出：
s = "This is a test string"
words = s.split()
reversed_words = [word[::-1] for word in words]
reversed_s = ' '.join(reversed_words)
print(reversed_s)
47.将一个字符串中的每个单词的字母顺序逆序输出：
s = "This is a test string"
words = s.split()
reversed_words = [''.join(reversed(word)) for word in words]
reversed_s = ' '.join(reversed_words)
print(reversed_s)
48.将一个字符串中的每个单词的首字母移到末尾：
s = "This is a test string"
words = s.split()
new_words = [word[1:] + word[0] + 'ay' for word in words]
new_s = ' '.join(new_words)
print(new_s)
49.将一个列表中的元素两两配对：
lst = [1, 2, 3, 4, 5, 6]
pairs = [(lst[i], lst[i+1]) for i in range(0, len(lst)-1, 2)]
print(pairs)
50.将一个列表中的元素分组：
lst = [1, 2, 3, 4, 5, 6]
groups = [[lst[i], lst[i+1]] for i in range(0, len(lst), 2)]
print(groups)
51.将一个字符串中的每个单词的首字母大写，并将其余字母小写：
s = "THIS IS A TEST STRING"
words = s.split()
new_words = [word.capitalize() for word in words]
new_s = ' '.join(new_words)
print(new_s)
52.将一个列表中的元素随机排序：
import random
lst = [1, 2, 3, 4, 5, 6]
random.shuffle(lst)
print(lst)
53.将一个字符串中的字母往后移动指定的位数：
def shift_letter(letter, shift):
shifted_letter = chr((ord(letter) - 97 + shift) % 26 + 97)
return shifted_letter
s = "hello"
shift = 3
shifted_s = ''.join([shift_letter(letter, shift) for letter in s])
print(shifted_s)
54.将一个字符串中的字母往前移动指定的位数：
def shift_letter(letter, shift):
shifted_letter = chr((ord(letter) - 97 - shift) % 26 + 97)
return shifted_letter
s = "khoor"
shift = 3
shifted_s = ''.join([shift_letter(letter, shift) for letter in s])
print(shifted_s)
55.求一个列表中的最大数和最小数：
lst = [1, 2, 3, 4, 5, 6]
max_num = max(lst)
min_num = min(lst)
print("Max:", max_num)
print("Min:", min_num)
56.求一个列表中的元素之和：
lst = [1, 2, 3, 4, 5, 6]
sum_lst = sum(lst)
print("Sum:", sum_lst)
57.求一个列表中的元素平均值：
lst = [1, 2, 3, 4, 5, 6]
avg_lst = sum(lst) / len(lst)
print("Average:", avg_lst)
58.求一个列表中的中位数：
def median(lst):
sorted_lst = sorted(lst)
lst_len = len(lst)
mid_index = lst_len // 2
if lst_len % 2 == 0:
return (sorted_lst[mid_index-1] + sorted_lst[mid_index]) / 2
else:
return sorted_lst[mid_index]
lst = [1, 2, 3, 4, 5, 6]
median_lst = median(lst)
print("Median:", median_lst)
59.求一个列表中的众数：
from collections import Counter
lst = [1, 2, 3, 2, 4, 3, 5, 6, 1]
cnt = Counter(lst)
mode = cnt.most_common(1)[0][0]
print("Mode:", mode)
60.求两个数的最大公约数：
def gcd(a, b):
if a % b == 0:
return b
else:
return gcd(b, a % b)
a = 48
b = 36
gcd_ab = gcd(a, b)
print("GCD:", gcd_ab)
61.求两个数的最小公倍数：
def lcm(a, b):
return (a * b) // gcd(a, b)
a = 48
b = 36
lcm_ab = lcm(a, b)
print("LCM:", lcm_ab)
62.将一个字符串中的每个单词首尾颠倒：
s = "This is a test string"
words = s.split()
reversed_words = [word[::-1] for word in words]
reversed_s = ' '.join(reversed_words)
print(reversed_s)
63.将一个字符串中的每个单词逆序输出，但保留单词之间的顺序：
s = "This is a test string"
words = s.split()
reversed_words = ' '.join([word[::-1] for word in words])
print(reversed_words)
64.将一个字符串中的大写字母转换为小写字母：
s = "Hello World"
lower_s = s.lower()
print(lower_s)
65.将一个字符串中的小写字母转换为大写字母：
s = "Hello World"
upper_s = s.upper()
print(upper_s)
66.将一个字符串中的大小写字母互换：
s = "Hello World"
swapcase_s = s.swapcase()
print(swapcase_s)
67.判断一个字符串是否为回文字符串：
def is_palindrome(s):
s = s.lower()
s = ''.join([c for c in s if c.isalnum()])
return s == s[::-1]
s = "A man, a plan, a canal: Panama"
print(is_palindrome(s))
68.将一个列表中的元素随机排序：
import random
lst = [1, 2, 3, 4, 5, 6]
random.shuffle(lst)
print(lst)
69.判断一个列表是否为递增列表：
def is_increasing(lst):
return all(x < y for x, y in zip(lst, lst[1:]))
lst = [1, 2, 3, 4, 5, 6]
print(is_increasing(lst))
70.判断一个列表是否为递减列表：
def is_decreasing(lst):
return all(x > y for x, y in zip(lst, lst[1:]))
lst = [6, 5, 4, 3, 2, 1]
print(is_decreasing(lst))
71.将一个列表中的元素去重：
lst = [1, 2, 3, 2, 4, 3, 5, 6, 1]
unique_lst = list(set(lst))
print(unique_lst)
72.将一个列表中的元素按照出现次数从高到低排序：
from collections import Counter
lst = [1, 2, 3, 2, 4, 3, 5, 6, 1]
cnt = Counter(lst)
sorted_lst = sorted(lst, key=lambda x: cnt[x], reverse=True)
print(sorted_lst)
73.将一个字符串中的每个单词按照出现次数从高到低排序：
from collections import Counter
s = "This is a test string with some repeated words like test and some"
words = s.split()
cnt = Counter(words)
sorted_words = sorted(words, key=lambda x: cnt[x], reverse=True)
sorted_s = ' '.join(sorted_words)
print(sorted_s)
74.计算一个数的平方根：
import math
x = 16
sqrt_x = math.sqrt(x)
print(sqrt_x)
75.计算一个数的立方根：
x = 8
cbrt_x = x**(1/3)
print(cbrt_x)
76.将一个二进制数转换为十进制数：
binary_num = "1011"
decimal_num = int(binary_num, 2)
print(decimal_num)
77.将一个八进制数转换为十进制数：
octal_num = "17"
decimal_num =
78.将一个十六进制数转换为十进制数：
hex_num = "1F"
decimal_num = int(hex_num, 16)
print(decimal_num)
79.将一个整数转换为二进制数：
x = 11
binary_x = bin(x)[2:]
print(binary_x)
80.将一个整数转换为八进制数：
x = 31
hex_x = hex(x)[2:]
print(hex_x)
81.将一个整数转换为十六进制数：
x = 31
hex_x = hex(x)[2:]
print(hex_x)
82.生成一个随机整数：
import random
random_num = random.randint(1, 10)
print(random_num)
83.生成一个随机小数：
import random
random_float = random.random()
print(random_float)
84.生成一个指定范围的随机小数：
import random
random_float = random.uniform(1.0, 10.0)
print(random_float)
85.从一个列表中随机选择一个元素：
import random
lst = ['apple', 'banana', 'orange']
random_item = random.choice(lst)
print(random_item)
86.从一个列表中随机选择指定个数的元素：
import random
lst = ['apple', 'banana', 'orange', 'pear', 'grape']
random_items = random.sample(lst, 3)
print(random_items)
87.计算一个列表中的所有元素之和：
lst = [1, 2, 3, 4, 5, 6]
sum_lst = sum(lst)
print(sum_lst)
88.计算一个列表中的所有元素的平均值：
lst = [1, 2, 3, 4, 5, 6]
avg_lst = sum(lst) / len(lst)
print(avg_lst)
89.计算一个列表中的所有元素的中位数：
import statistics
lst = [1, 2, 3, 4, 5, 6]
median_lst = statistics.median(lst)
print(median_lst)
90.计算一个列表中的所有元素的中位数：
from collections import Counter
lst = [1, 2, 3, 2, 4, 3, 5, 6, 1]
cnt = Counter(lst)
mode_lst = [k for k, v in cnt.items() if v == max(cnt.values())]
print(mode_lst)
91.计算一个列表中所有元素的标准差：
import statistics
lst = [1, 2, 3, 4, 5, 6]
stdev_lst = statistics.stdev(lst)
print(stdev_lst)
92.计算一个列表中所有元素的方差：
import statistics
lst = [1, 2, 3, 4, 5, 6]
var_lst = statistics.variance(lst)
print(var_lst)
93.对一个列表进行排序：
lst = [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5]
sorted_lst = sorted(lst)
print(sorted_lst)
94.对一个列表进行倒序排序：
lst = [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5]
reverse_sorted_lst = sorted(lst, reverse=True)
print(reverse_sorted_lst)
95.将两个列表合并：
lst1 = [1, 2, 3]
lst2 = [4, 5, 6]
merged_lst = lst1 + lst2
print(merged_lst)
96.将两个列表进行zip操作：
lst1 = [1, 2, 3]
lst2 = [4, 5, 6]
zipped_lst = list(zip(lst1, lst2))
print(zipped_lst)
97.将一个列表中的元素去重：
lst = [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5]
distinct_lst = list(set(lst))
print(distinct_lst)
98.判断一个字符串是否为回文串：
s = "level"
is_palindrome = s == s[::-1]
print(is_palindrome)
99.将一个字符串中的单词进行反转：
s = "Hello World"
reversed_words = ' '.join(word[::-1] for word in s.split())
print(reversed_words)
100.将一个字符串中的字符进行计数：
s = "hello world"
char_count = {char: s.count(char) for char in set(s)}
print(char_count)
