python nine classes --1

Change #temoerature 
tempStr = INPUT ( "Please enter the temperature value with a negative sign") 
IF tempStr [-1] in [ 'F.', 'F']: 
    C = (the eval (tempStr [0: -1]) - 32 ) / 1.8 
    Print ( "temperature after conversion {:} .2f C" .format (C)) 
elif tempStr [-1] in [ 'C', 'C']: 
    F. = 1.8 * the eval (tempStr [0: -1]) + 32 
    Print ( "temperature after conversion {:} F. .2f" .format (F.)) 
the else: 
    Print ( "input error") 

Python code indentation required to be consistent with the length of 
a single line comment with # 
plurality of rows Note '' '' '' 
naming convention is not the first letter numbers 
reserved temporarily now a total of 33 words learn if elif else import print in for 
the string class is represented by a single or double quotes quotes 
list is the default type [ ] the 


index vs slice 
index return a single character using [] Gets a character string of 
[-1] retrieves the penultimate character 
slice: returns the substring period [1: 3] take 1 [0,-1], but not the string starting from 0 - 1 




, there are two string representations: forward and reverse decreasing number AMRIS

Forward Increment Number: 01234 .....

Reverse decrement ID: ...- 5-4-3-2-1 

used to determine whether an element in the list 

of the evaluation function: eval 
can remove the outermost quotes remaining parameters and execute the statement

Obtaining a user input integer, the reference integer value, printout "Hello World", requires:

If the input value is 0, direct output "Hello World"

If the input value is greater than 0, the output mode line of two characters "Hello World" (also a space character)

If the input value is less than 0, the output in a perpendicular manner "Hello World"

temp = eval(input())
if temp == 0:
print("Hello World")
elif temp > 0:
print("He\nll\no \nWo\nrl\nd")
else:
for i in "Hello World":
print(i)

Obtaining user input of a character string, the following format:

M ON A

Wherein, M and N is any number that represents OP an operation expressed as the following four: +, -, *, / (addition, subtraction)

The OP in accordance with the calculation result, the output M OP N, unified storage for 2 decimal places.

注意：M和OP、OP和N之间可以存在多个空格，不考虑输入错误情况。

temp = input()
print("{:.2f}".format(eval(temp)))

python nine classes --1

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