Python 摘要

參見 Python初學 條件判斷 迴圈 檔案處理

• 註解

# comment


          # 這個變數用來儲存我的名字
          name = 'Simon'
        

• if

if condition1:
      statement1
elif condition2:
      statement2
else:
      statement3

          score = int(input("請輸入成績"))
          if score >= 60:
              print("成績及格!")
          else:
              print("成績不及格!")
        

• 布林運算子

condition1 or condition2
condition1 and condition2
not condition


          score = int(input("請輸入成績"))
          if score >= 90:
              print("成績 A")
          elif score > 70 and score < 90:
              print("成績 B")
          else:
              print("成績 C")
        

• for

for x in sequence:
      statement1


          theBeatles = ['John Lennon', 'Paul McCartney', 'Ringo Starr', 'George Harrison']
          for i in theBeatles:
              print(i)
        

          for i in range(10):
              print(i, end=" ")
              
          print() #換行
          for i in range(20, 2, -2):
              print(i, end=" ")
        

          for i in range(1, 10):
              for j in range(1, 10):
                  if j == 9:
                      print("\t", i*j) # j == 9時，換行
                  else:
                      print("\t", i*j, end = '') # j < 9時，不換行
        

• try except

try:
      statement1
except except_name:
      statement2


          try:
              a = int(input())
              b = int(input())
              print(a/b)
          except ZeroDivisionError:
              print("Cannot divide by 0!")
          except:
              print("Wrong input")
          else:
              print("The answer is " + str(c))
          finally:
              print("Program finished")