1把变量meal的值设置为44.50
[python]
#Assign the variable meal the value 44.50 on line 3!
meal = 44.50
1 把变量tax的值设置为6.75%
[python]
meal = 44.50
tax = 6.75/100
1 设置tip的值为15%
[python]
#You're almost there! Assign the tip variable on line 5.
meal = 44.50
tax = 0.0675
tip = 0.15
1 把变量meal的值设置为meal meal*tax
[python]
#Reassign meal on line 7!
meal = 44.50
tax = 0.0675
tip = 0.15
meal = meal meal*tax
设置变量total的值为meal meal*tax
[python]
#Assign the variable total on line 8!
meal = 44.50
tax = 0.0675
tip = 0.15
meal = meal + meal * tax
total = meal + meal * tip
print("%.2f" % total)
3 设置变量brian值为"Always look on the bright side of life!"
[python]
#Set the variable brian on line 3!
brian = "Always look on the bright side of life!"
1 练习
1 把变量caesar变量设置为Graham
2 把变量praline变量设置为john
3 把变量viking变量设置为Teresa
[python]
#Assign your variables below, each on its own line!
caesar = "Graham"
praline = "John"
viking = "Teresa"
#Put your variables above this line
print caesar
print praline
print viking
2 练习把'Help! Help! I'm being repressed!' 中的I'm中的'进行转义
[python]
#The string below is broken. Fix it using the escape backslash!
'Help! Help! \'\m being repressed!'
2 练习： 把变量fifth_letter设置为MONTY的第五个字符
[python]
"""
The string "PYTHON" has six characters,
numbered 0 to 5, as shown below:
+---+---+---+---+---+---+
| P | Y | T | H | O | N |
+---+---+---+---+---+---+
0 1 2 3 4 5
So if you wanted "Y", you could just type
"PYTHON"[1] (always start counting from 0!)
"""
fifth_letter = "MONTY"[4]
print fifth_letter