#讀取檔案操作，
# 當前路徑
with open('pi.txt') as file:
    print(file.read())
# 絕對路徑
with open('D:\db.txt') as file:
    print(file.read())

# 這樣執行打出來的會多一行空白，是因為每個末尾都有一個換行符
filename='pi.txt'
with open(filename) as file:
    for line in file:
        print(line)
#讓圓周率連在一起
filename="pi.txt"
with open(filename) as file:
    lines=file.readlines()
 
p_string=''
for line in lines:
    p_string+=line.strip()
print(p_string)
print(len(p_string))

#圓周率有你的生日沒有
filename="pi.txt"
with open(filename) as file:
    lines=file.readlines()
    p=''
    for line in lines:
        p+=line.rstrip()
birthday=input("Enter you birthday:")
if birthday in p:
    print("Your birthday appears in the first million digits of pi")
 
else:
    print("not apperas ")

#總結：readLine 從字面意思可以看出，該方法每次讀出一行內容，所以，讀取時佔用記憶體小，比較適合大檔案，該方法返回一個字串物件。,ReadLines 一起性讀取文中所有的行數，並按行返回到list，方便我們遍歷
read() ： 一次性讀取整個檔案內容。推薦使用read(size)方法，size越大執行時間越長

# 寫入檔案操作
# 指定開啟檔案時，讀取模式r,寫入模式w,附加模式a，讓你能讀取和寫入檔案的模式r+,如果是省略模式
#則預設只讀，如果寫入檔案不存在，會自動建立，用w時候要小心，如果存在了，會返回物件前清空該檔案
filename="li.txt"
 
with open(filename,'w') as file:
    file.write("I love programming.\n")
    file.write("I love programming.\n")
#追加模式a
filename="li.txt"
with open(filename,'a') as file:
    file.write("I love dataing.\n")
    file.write("I love swiming.\n")

#異常,如果Try 中的沒有問題，那麼就輸出try 中的內容，如果有問題，就輸出except
try:
    print(5/0)
except ZeroDivisionError:
    print("You can't divide by zero!")

#else 程式碼塊， 依賴於try 執行成功後的程式碼塊都要放在else 程式碼塊中
print("Give me two number, I  will divide it")
while True:
    first_number=input("\n First number:")
    if first_number=='q':
        break
    second_number=input("\n second number:")
    try:
        answer=int(first_number)/int(second_number)
    except ZeroDivisionError:
        print("You can't divie by 0")
    else:
        print(answer)
#檔案異常 FileNotFoundError
filename='hell.txt'
try:
    with open(filename) as file:
       contents= file.read()
except FileNotFoundError:
    msg="Sorry,the file "+filename+" not exist"
    print(msg)

# 統計文字有多少個單詞，這些檔案可能不存在
def count_words(filename):
  try:
    with open(filename) as file:
        contents=file.read()
  except FileNotFoundError:
        msg="sorry,the file not exist"
        print(msg)
  else:
        word=contents.split()
        numwords=len(word)
        print(filename+" has about "+str(numwords))
filename=['alice.txt','li.txt','pi.txt']
for f in filename:
    count_words(f)
    
    
    
#失敗時一聲不吭,pass 這個表示直接略過，pass 就是不做任何操作
def count_words(filename):
  try:
    with open(filename) as file:
        contents=file.read()
  except FileNotFoundError:
       pass
  else:
        word=contents.split()
        numwords=len(word)
        print(filename+" has about "+str(numwords))
filename=['alice.txt','li.txt','pi.txt']
for f in filename:
    count_words(f)

還有json操作，但是我認為書上說的淺。回頭補資料