Question

我在代码上苦苦挣扎，我不能使用Pandas。我看了其他解释，但我认为他们很难理解。

file=open("Details.csv","a" )
file.append(str"Username" + str"Password" + str"Age" + str"Topic" + 
str"Difficulty" + str"Score"\n)
print("Before we start, we need to register an account.\n")           
User=input(str("Enter your name:\n "))
Age=input("Enter your age:\n")
print("Great! Your username is set to: %s."%(User[0]+User[1]+User[2]+ Age))
Pass=input("Enter a password for your account:\n ")

所以我试图在csv文件中获得6列，用户名，密码，年龄，主题，难度和分数。

提前致谢。

Answer 1

修改

我经历了所有麻烦只是为了不真正回答问题标题的范围。如果您使用csv模块，则写入.csv非常简单。模块将文件写为iterables（即值列表）。它通过调用csv.writer.writerow()来实现。没有任何约束条件，预期标头的长度必须等于您写入文件的任何可迭代的长度。

<强>响应：

我总是使用标准库的忠实粉丝。该库内部是一个名为csv的模块。您尝试做的所有事情（或者至少是您告诉我们的事情）都可以使用此模块完成。

让我们来解决问题。

首先，我们将看看您尝试过的内容：

# you've opened a file for appending (the mode = 'a') # why do we need to append it? are we assuming that there is already data? file=open("Details.csv","a" ) # this shouldn't ever work (I dont think ive ever seen this either) # are these supposed to be headers? file.append(str"Username" + str"Password" + str"Age" + str"Topic" + str"Difficulty" + str"Score"\n) print("Before we start, we need to register an account.\n") # okay you are getting a user input # however, the input() method returns 'str' # so you dont need to call str() on a 'str'! User=input(str("Enter your name:\n ")) # now here if you want an 'int' for the age you call int() Age=input("Enter your age:\n") print("Great! Your username is set to: %s."%(User[0]+User[1]+User[2]+ Age)) # why dont you call str() here like you did before? # is this a different type? Pass=input("Enter a password for your account:\n ") # woah, you never do anything with your inputs # nor do you close the file!

显然这里有很多未知数。因此，让我们来看看你应该做什么：

import csv myCSV = '/path/to/Details.csv' headers = ['Username', 'Password', 'Age', 'Topic', 'Difficulty', 'Score'] # using 'with open()' is called context managing # with is the context manager # what this means is when we are done with the file it auto-closes # I am just going to assume nothing is in the file # if there is, next time just dont call w.writerow(headers) with open(myCSV, 'w') as f: w = csv.writer(f, delimiter=',') w.writerow(headers) # we can drop the '\n' because after print() we go to the next line always print("Before we start, we need to register an account.") user = input("Enter your name:\n") # since you concatenate below, I'll assume you want a 'str' age = input("Enter your age:\n") print ("Great! Your username is set to: {}".format(user[:3] + age)) pass = input("Enter a password for your account:\n") # then do the same for Topic, Difficulty and Score values = [user, pass, age, topic, diff, score] w.writerow(values)

对于字符串格式化方法，请查看this以获取更新语法。

Answer 2

我建议您查看csv库（https://docs.python.org/2/library/csv.html）并按此顺序执行操作

with open('Details.csv', 'wb') as file:
    writer = csv.writer(file)
    writer.writerow(["Username", "Password", "Topic", "Difficulty", "Score"])

这将创建包含您指定的标题名称的列。

在CSV文件中创建列

2 个答案: