1. 3位整數逆序
num = input("請輸入一個三位整數:")
print(num[::-1])
2. if - else 練習
sex = input('請輸入您的性別(F 或 M): ')
age = int(input("請輸入您的年齡: "))
if sex == "M":
if age < 30:
print('young')
elif age <= 36:
print('marriageable age')
else:
print('old')
elif sex == 'F':
if age < 25:
print('young')
elif age <= 30:
print('marriageable age')
else:
print('old')
else:
print('wrong')
3. if-else 和 數學計算 練習
#Python學習交流群：778463939
my_str = input("What's the temperature? ")
if my_str[-1] in ['F', 'f']:
C = round((eval(my_str[0:-1]) - 32) / 1.8, 1)
print(f"The converted temperature is {C}C.")
elif my_str[-1] in ['C', 'c']:
F = round(1.8 * eval(my_str[0:-1]) + 32, 1)
print(f"The converted temperature is {F}F.")
else:
print("input error my dear.")
4. 回圈: 檔案讀寫
with open("movie.txt") as f_in:
with open("out.txt") as f_out:
for line in f_in:
# 假設每行資料, 分割符是 ','
line_list = line.split(',')
# 時長 Lasting 是最后一列
if line_list[-1] < 90:
# 將該行序號寫到 out.txt
f_out.write(str(line_list[0]))
5.回圈練習: 親密數
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x = int(input("請輸入一個正整數: "))
for a in range(2, x):
b = 0
for i in range(1, a):
if a % i == 0:
b += i
r = 0
for j in range(1, b):
if b % j == 0:
r += j
if r == a and a < b:
print(a, b)
6.回圈: 邏輯判斷
n = int(input('請輸入最大兵力人數: '))
for i in range(n + 1):
if (i % 3 == 2) and (i % 5 == 1) and (i % 7 == 0):
print(i, end=' ')
7.串列推導式
num = int(input("請輸入一個 1-100 間的整數: "))
print([i for i in range(1, num + 1) if i % 2 != 0])
8.正則運算式
# 匹配: 首字母為 '數字或下劃線, 其余字母為 字母,數字,下劃線'
import re
my_str = input("請輸入您將要注冊的用戶名: ")
ret = re.match(r"[a-z_]?[a-z\d\s_]*", my_str)
print(ret.group())
print(True) if ret else print(False)
9.字典按值排序
import operator
int(input("輸入您要處理的整數個數: "))
num_lst = list(map(int, input("請在一行輸入, 兩兩間用 空格 隔開").split()))
my_dict = {}
for num in num_lst:
if num not in my_dict:
my_dict[num] = 1
else:
my_dict[num] += 1
items = sorted(my_dict.items(), key=operator.itemgetter(1), reverse=True)
for i, j in items:
print(str(i) + ' ' + str(j))
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