update

challenges1-11/challenage-008.py

@@ -1,3 +1,4 @@
 bill_price = int(input('Please enter bill total price : '))
 number_of_diners = int(input('Please enter diners number : '))
+# round(数值, 小数点位数)
 print('the price for each person is {0}'.format(round(bill_price/number_of_diners,2)))

challenges1-11/challenage-011.py

@@ -1,4 +1,5 @@
 large = int(input('enter number over than  100 : '))
 small = int(input('enter number smaller than 10 : '))
+# // floor division 相当于c中的floor函数
 answer = large//small
 print('{0} goes into {1} for {2} times'.format(small, large, answer))

challenges12-19/challenge-015.py

@@ -1,9 +1,7 @@
 color = str(input('Enter you favourite colour : '))
-if color == 'red':
-    print('I like red too')
-elif color == 'RED':
-    print('I like red too')
-elif color == 'Red':
+Color = color.capitalize()
+
+if Color == 'Red':
     print('I like red too')
 else:
     print('I don\'t like {0}, I prefer red'.format(color))

challenges20-26/challenge-020.py

@@ -1,2 +1,3 @@
 name = str(input('enter your name to check length : '))
+# len()不止能够计算str的长度 它可以返回所有容器的长度
 print('{0} name length is {1}'.format(name, len(name)))

challenges20-26/challenge-022.py

@@ -1,4 +1,5 @@
 first_name = str(input('Enter your first name in lower-case : '))
 surname = str(input('Enter your surname in lower-case : '))
+# title就是把word转换为标题形式
 compact = first_name.title() + ' ' + surname.title()
 print(compact)

challenges20-26/challenge-023.py

@@ -1,4 +1,5 @@
 rhyme = str(input('Enter the 1st. line of nursery rhyme : '))
 start = int(input('Enter start number for display : '))
 end = int(input('Enter end number for display : '))
+# 截断字符串包含start位不包含end位
 print('this is the 1st. line \n {0} \n and this is truncated {1}'.format(rhyme, rhyme[start:end]))

challenges27-34/challenge-028.py

@@ -1,3 +1,3 @@
 number = float(input('Enter number with lots of decimal number : '))
-print(round(number*2, 2))
-
+#print(round(number*2, 2))
+print(round(number*2))

challenges27-34/challenge-029.py

@@ -1,4 +1,5 @@
 import math
 
 number = int(input('Enter number over 500 : '))
-print(round(math.sqrt(number)))
+#print(round(math.sqrt(number)))
+print(round(math.sqrt(number), 2))

challenges27-34/challenge-030.py

@@ -1,3 +1,3 @@
 import math
-
-print(round(math.pi, 5))
+dig = int(input("how many digits you want: "))
+print(round(math.pi, dig))

challenges27-34/challenge-031.py

@@ -1,5 +1,6 @@
 import math
 
 radius = float(input('Enter circle radius : '))
+# ** 表示幂计算
 area = math.pi * (radius**2)
 print(area)

challenges45-51/challenge-049.py

@@ -1,4 +1,7 @@
-compnum = 50
+import numpy as np
+
+compnum = np.random.randint(1, 100)
+
 count = 0
 number = int(input('Enter number to guess : '))
 while number != compnum: